shoulder girdle - mercer county community college - mccc - west
TRANSCRIPT
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Shoulder Girdle
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Clarification of Terms
• Shoulder girdle = scapula and clavicle
• Shoulder joint (glenohumeral joint) = scapula and humerus
• What is the purpose (or function) of the shoulder and entire upper extremity?
• The glenohumeral joint is the most mobile joint in the body.
• However, when we talk about shoulder motion, we must realize that motion occurs at three other joints as well.
Lippert, p115
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Clarification of Terms…cont
• The Shoulder Complex:
• Is a term that is used to include all of the structures involved with shoulder motion
• It consists of the following bones:
• Scapula
• Clavicle
• Sternum
• Humerus
• Rib cage
• It consists of the following joints:
• Glenohumeral (GH joint)
• Sternoclavicular (SC joint)
• Acromioclavicular (AC joint)
• Scapulothoracic
Lippert, p115
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Clarification of Terms…cont
• Scapulothoracic Joint:
• Not a joint in the pure sense of the word
• The scapula and thorax do not have a point of fixation (the scapula and thorax are not directly attached, but are connected indirectly by the clavicle and several muscles)
• But, the scapula DOES move over the rib cage of the thorax, providing motion and flexibility
Lippert, p116
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Osteology of the Shoulder Girdle (Bones) • Scapula
• Triangular shaped bone
• Located superficially on the posterior side of the thorax
• Slightly concave anteriorly
• Located between the second and seventh ribs with the vertebral border 2-3 inches away from the spinous processes
• Spine of the scapula level with spinous process of T3-T4
• Clavicle • S-shaped bone
• Sternum • Flat bone
• Located in the midline of anterior thorax
• Divided into manubrium, body and xiphoid process
Lippert, p116-117
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Osteology of the Shoulder Girdle (Bones) • Scapula:
• Superior angle
• Inferior angle
• Vertebral border
• Axillary border
• Spine (scapular spine)
• Base of the spine of the scapula
• Coracoid process
• Acromion process
• Glenoid fossa
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(Axillary)
(Vertebral)
Scapula (Dorsal aspect)
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(Vertebral)
(Axillary)
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Osteology of the Shoulder Girdle (Bones) • Clavicle:
• Sternal end
• Acromial end
• body
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Medial Lateral
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Osteology of the Shoulder Girdle (Bones) • Sternum:
• Manubrium
• Body
• Xiphoid process
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Joint Structure & Movement of the Shoulder Girdle • Sternoclavicular (SC) joint
• Structure
• Movement
• Supporting Structures (Ligaments, etc)
• Acromioclavicular (AC) joint
• Structure
• Movement
• Supporting Structures (Ligaments, etc)
• Scapulothoracic joint
Lippert, p
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Joint Structure & Movement of the Shoulder Girdle…cont • Sternoclavicular (SC) Joint Structure
• Joint created by the articulation of the medial aspect of the clavicle with the sternum
• This joint provides the only direct attachment of the upper extremity to the axial skeleton
• Synovial joint – saddle joint with concave and convex surfaces on each of the joint’s articular surfaces
• This allows the clavicle to move in all three planes (3 degrees of freedom!)
• In essence, all movements of the shoulder girdle originate at the SC joint. Therefore, a fused SC joint would significantly limit movement of the clavicle and scapula, and the entire shoulder.
Mansfield, p54
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Joint Structure & Movement of the Shoulder Girdle…cont • Sternoclavicular (SC) Joint Movement
• Elevation and Depression of the SC joint
• Protraction and Retraction of the SC joint
• Axial Rotation of the clavicle
Mansfield, p55
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Joint Structure & Movement of the Shoulder Girdle…cont • Sternoclavicular (SC) Joint Supporting Structures
• Sternoclavicular Ligament
• Connect clavicle to manubrium
• Interclavicular Ligament
• Spans jugular notch, connecting the superior medial aspects of the clavicles
• Costoclavicular Ligament
• Clavicle to costal cartilage of first rib
• Joint Capsule
• Surrounds entire SC joint
• Articular Disk
• Acts as shock absorber between clavicle and sternum
Mansfield, p55
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Joint Structure & Movement of the Shoulder Girdle…cont • Acromioclavicular (AC) Joint Structure and Movement
• Joint created by the articulation of the acromion process of the scapula with the lateral end of the clavicle
• Synovial joint – plane shaped joint
• The AC joint allows motion in all 3 planes:
• Upward and downward rotation
• Rotation in the horizontal plane
• Rotation in the sagittal plane
• These motions allow the scapula to maintain firm contact with the posterior thorax
Mansfield, p58
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Joint Structure & Movement of the Shoulder Girdle…cont • Acromioclavicular (AC) Joint Supporting Structures
• Acromioclavicular Ligament
• Joins clavicle to acromion, prevents dislocations of the scapula
• Coracoclavicular Ligament
• Connect corocoid process of the scapula to the clavicle
• Coracoacromial Ligament
• Connects the coracoid process to the acromion process
• Attached on both ends to the same bone!
• Creates a roof that protects the head of the humerus
Lippert, p 118
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Joint Structure & Movement of the Shoulder Girdle…cont • Scapulothoracic Joint Structure and Movement
• The junction between the anterior aspect of the scapula and the posterior thorax
• Movements include
• Elevation and depression
• Protraction and retraction
• Upward and downward rotation
• Scapular tilt
• “pinching the shoulder blades together” = _____?_______
Lippert, p 119
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Their scapulae are protracted…
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The inferior angle of the scapula can be visualized in “A” in a neutral
position. It moves up and out as the UE are flexed and ABDucted as
indicated by the arrow in “B.”
The reference points are the inferior and superior angles of the scapula.
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Scapular Tilt • Occurs when the
glenohumeral joint goes
into hyperextension
• The superior end of the
scapula tilts anteriorly and
the inferior end tilts
posteriorly
• Examples: “windup” phase
of a softball pitch, a
bowling delivery, or a
racing dive in swimming
Lippert, p119
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Joint Structure & Movement of the Shoulder Girdle…cont • Companion Motions of the Glenohumeral Joint and Shoulder
Girdle
• When there is movement of the glenohumeral joint, there is also movement of the scapulothoracic joint
Lippert, p 120
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Joint Structure & Movement of the Shoulder Girdle…cont • Companion Motions of the Glenohumeral Joint and Shoulder
Girdle
• The table below summarizes the shoulder girdle motions that must occur during various glenohumeral joint motions:
Lippert, p120
Glenohumeral Joint Shoulder Girdle
Flexion Upward rotation, protraction
Extension Downward rotation, retraction
Hyperextension Scapular tilt
Abduction Upward rotation
Adduction Downward rotation
Medial rotation Protraction
Lateral rotation Retraction
Horizontal abduction Retraction
Horizontal adduction Protraction
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Mental Exercise:
• http://www.youtube.com/watch?v=_Ia0VvT81xc
• Watch this video and discuss with your partner the relationship between movement of the scapula and movement of the glenohumeral joint when the arm is flexed overhead.
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Joint Structure & Movement of the Shoulder Girdle…cont • Scapulohumeral Rhythm
• The first 30 degrees of shoulder joint motion is pure glenohumeral joint motion
• After that, for every 2 degrees of shoulder flexion or abduction that occurs, the scapula must upwardly rotate 1 degree
• This 2:1 ratio is known as scapulohumeral rhythm
Lippert, p120
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Myology of the Shoulder Girdle (Muscles) • There are 5 muscles primarily responsible for moving the
scapula:
• Trapezius
• Levator scapula
• Rhomboids
• Serratus anterior
• Pectoralis minor
• Muscle Descriptions provided:
• O: Origin (proximal attachment)
• I: Insertion (distal attachment)
• A: Action (joint motions in which it is a prime mover)
• N: Nerve Innervation
Lippert, p121
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Upper Trapezius
Origin Occiput, nuchal ligament on
cervical vertebrae
Insertion Lateral third of the clavicle & the
acromion process
Action
Scapular elevation, upward
rotation, retraction
Innervatio
n
Spinal accessory n. (Cranial n.
XI)
Lippert, p122
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…stretch the upper trapezius?
…strengthen the upper trapezius?
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Middle Trapezius
Origin Nuchal ligament, spinous
processes of C7-T5
Insertion Medial aspect of acromion
process & along the scapular
spine
Action
Scapular retraction
Innervatio
n
Spinal Accessory n. (Cranial n.
XI)
Middle Trap
Lippert, p122
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Lower Trapezius
Origin Spinous processes T6-T12
Insertion
Base of the spine of the scapula
Action Scapular depression, upward
rotation and retraction of the
scapula
Innervatio
n
Spinal accessory n., Cranial n. XI
Lower Trap Lippert, p122
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Levator Scapula
Origin Transverse processes of C1-C4
Insertion Vertebral border of the scapula
between the superior angle and
the base of the spine
Action Scapular elevation, downward
rotation
Innervation Dorsal Scapular n., (spinal
nerves C3-C5)
Levator Scapula
Lippert, p123
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Rhomboids
Origin Nuchal ligament and spinous
processes C7-T5
Insertion
Vertebral border of the
scapula from the base of the
scapular spine to the inferior
angle
Action Scapular retraction &
elevation, downward rotation
Innervation Dorsal scapular n.
Lippert, p124
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…stretch the rhomboids?
…strengthen the rhomboids?
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Serratus Anterior
Origin External surface of the lateral first
9 ribs
Insertion
Vertebral border of the scapula
near the inferior angle, on the
anterior surface of scapula
Action Scapular protraction, upward
rotation, holds the scapula against
the posterior thorax
Innervation Long thoracic n.
Scapular Winging (2o to weak serratus anterior)
Lippert, p124
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…strengthen serratus anterior in an
against gravity position?
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Pectoralis Minor
Origin Anterior aspect of ribs 3-5
Insertion
Coracoid process of the
scapula
Action Scapular depression,
downward rotation, anterior
tilt
Innervation Medial pectoral n.
Lippert, p125
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Myology of the Shoulder Girdle (Muscles)…cont • Prime Movers of the Shoulder Girdle
Lippert, p 126
Action Muscles
Retraction Middle trapezius, rhomboids
Protraction Serratus anterior, pectoralis minor
Elevation Upper trapezius, levator scapulae, rhomboids
Depression Lower trapezius, pectoralis minor
Upward Rotation Upper and lower trapezius, serratus anterior
Downward Rotation Rhomboids, levator scapula, pectoralis minor
Scapular Tilt Pectoralis minor
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Myology of the Shoulder Girdle (Muscles)…cont • Anatomical Relationships
• All 5 shoulder girdle muscles originate on the trunk
• 3 are located posteriorly, 1 laterally, 1 anteriorly
• Of the three posterior muscle, the trapezius is the most superficial
• The right and left upper, middle and lower trapezius covers most of the back in the shape of a diamond.
• Remove the trapezius, and the rhomboids and levator scapula lie directly underneath
• Pectoralis minor is anterior and deep to the pectoralis major
• Serratus anterior crosses the lateral chest wall
Lippert, p125
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Myology of the Shoulder Girdle (Muscles)…cont • Anatomical Relationships
Lippert, p125
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Myology of the Shoulder Girdle (Muscles)…cont • Force Couple
• A force couple is defined as muscle pulling in different directions to accomplish the same motion
• Upward Rotation of the scapula
• the upper trapezius pulls up, the lower trapezius pulls down and the serratus anterior pulls outward.
• Downward Rotation of the Scapula
• The pectoralis minor pulls down, the rhomboid muscles pull in and the levator scapula pulls up
Lippert, p126
Upward Rotation of the Scapula
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Myology of the Shoulder Girdle (Muscles)…cont • Summary of Muscle Innervation:
Lippert, p 127
Muscle Nerve Spinal Segment
Trapezius Cranial Nerve XI C3, C4
Levator Scapula Dorsal Scapular C3, C4, C5
Rhomboids Dorsal Scapular C5
Serratus Anterior Long Thoracic C5, C6, C7
Pectoralis Minor Medial Pectoral C8, T1
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Pin the Tail on the… • Identify the location of the
• Scapular elevators
• Scapular depressors
• Scapular retractors
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References
• Lippert, L.S. (2011). Clinical Kinesiology and Anatomy, 5th ed. Philadelphia, PA: F.A. Davis.
• Mansfield, P.J., & Neumann, D.A. (2009). Essentials of Kinesiology for the Physical Therapist Assistant. St. Louis, MO: Mosby Elsevier.