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Biology 160 Arm Muscles
Deltoid
ORIGIN• Anterior – lateral 1/3 of the clavicle• Medial – Acromion process• Posterior – lower portion of the spine of the
scapula
INSERTION• Deltoid Tuberosity
FUNCTION • Abducts arm• Flexes arm• Extends arm
Deltoid
Biceps Brachii
ORIGIN• Supraglenoid Tubercle of
scapula• Coracoid process of scapula
INSERTION• Radial Tuberosity
FUNCTION• Flexes and supinates arm
Biceps Brachii
Brachialis
ORIGIN• Anterior Humerus
INSERTION• Coronoid process• Tuberosity of ulna
FUNCTION• Flexes elbow
Brachialis
Flexor Carpi Ulnaris
ORIGIN• Medial epicondyle of humerus
INSERTION• Pisiform• hook of hamate• base of 5th metacarpal
FUNCTION• Flex and adduct wrist• Ulnar deviation Flexor Carpi Ulnaris
Palmaris Longus
ORIGIN• Medial Epicondyle of
humerus
INSERTION• Palmar Aponeurosis
FUNCTION• Flex wrist
Palmaris Longus
Flexor Carpi Radialis
ORIGIN• medial epicondyle of
humerus
INSERTION• base of the 2nd and 3rd
metacarpals
FUNCTION• Flexes and abducts wrist
Flexor Carpi Radialis
Flexor Digitorum Superficialis
ORIGIN • Medial epicondyle of the
humerus• Shaft of the radius
INSERTION• Both sides of the middle
phalynx of the fingers
FUNCTION• Flexes the fingers
Flexor Digitorum Superficialis
Special Notes
• The common origin for the flexors of the wrist is the medial epicondyle of the humerus.
• The Palmaris Longus is completely absent in about 8% of the population.
Brachioradialis
ORIGIN• Lateral epicondyle of the
humerus
INSERTION• Styloid process of the
radius
FUNCTION• Flexes and supinates
forearm Brachioradialus
Pollicis Muscles (just know Function)
FUNCTION• Adduct, flex, abduct,
extend and oppose the thumb
Pollicus Muscles
Rotator Cuff Muscles
1. Supraspinatus (GT)2. Infraspinatus (GT)3. Subscapularis (LT)4. Teres Minor (GT)
*** Special note that one function of all the rotator cuff muscles is shoulder stabilization.
Supraspinatus
ORIGIN• Supraspinous fossa of the
scapula
INSERTION• Greater Tuberosity of the
humerus
FUNCTION• Abducts the arm Supraspinatus
Infraspinatus
ORIGIN• Infraspinous fossa of the
scapula
INSERTION• Greater tuberosity of the
humerus
FUNCTION• Lateral rotation of the
humerus Infraspinatus
Subscapularis
ORIGIN• Anterior surface of the
scapula
INSERTION• Lesser tuberosity of the
humerus
FUNCTION• Medial rotation of the
humerusSubscapularis
Teres Minor
ORIGIN• Lateral border of the
scapula
INSERTION• Greater tuberosity of the
humerus
FUNCTION• Lateral rotation of the
humerus Teres Minor
Teres Major
ORIGIN• Lateral border of the scapula
INSERTION• Medial lip of the
intertubercular groove of the humerus
FUNCTION• Extends, adducts and medially
rotates the humerus “swimming motion”
Teres Major
Triceps Brachii
ORIGIN • Infraglenoid tubercle of the
humerus• Lateral and medial surfaces of
humerus
INSERTION• Olecranon process of the ulna
FUNCTION• Extends the elbow
Triceps Brachii
Extensor Carpi Radialis Longus
ORIGIN• Lateral epicondyle of the
humerus
INSERTION• Base of the 2rd metacarpal
FUNCTION• Extends and abducts wrist• Radial deviation
Extensor Carpi Radialis Longus
Extensor Carpi Radialis Brevis
ORIGIN• Lateral epicondyle of the
humerus
INSERTION• base of the 3rd metacarpal
FUNCTION• Extends and abducts wrist• Radial deviation Extensor Carpi Radialis Brevis
Extensor Digitorum Communis
ORIGIN • Lateral epicondyle of the
humerus
INSERTION• Posterior surfaces of fingers 2-
5
FUNCTION• Extends fingers and wrist
Extensor Digitorum Communis
Extensor Carpi Ulnaris
ORIGIN• Lateral epicondyle of the
humerus
INSERTION• Base of the 5th metacarpal
FUNCTION• Extends and adducts the wrist• Ulnar deviation
Extensor Carpi Ulnaris
Rhomboid Major
ORIGIN• Spinous process of
T2 – T5
INSERTION• Medial border of the
scapula
FUNCTION• Scapula retraction
Rhomboid Minor
ORIGIN• Spinous process of
C7-T1
INSERTION• Medial border of the
scapula
FUNCTION• Retracts the scapula
Biology 160 Muscles (Need to Know)
• Due to the amount of information and the lack of study time the lab I have decided to eliminate some of the material for the lab final on muscles. Below is a list of the information that you will need to know.
• ****You will need to know the function and location for all the muscles in your lab book
Biology 160 Muscles (Need to Know)
ARM LAB 1You will need to know the origins, insertions
and functions for these muscles
• 1,2,3,4,5,6,7,8,10,11,12,13,15,16
• 17,18,19,20 (Just the origin)
Biology 160 Muscles (Need to Know)
Leg Lab 2You will need to know the origins, insertions
and functions for these muscles
• 1,2,4,5,6,7,8,9,11,12,17,18,19,20,21,22,
• Psoas Major and Iliacus
Biology 160 Muscles (Need to Know)
Torso Lab 3You will need to know the origins, insertions
and functions for these muscles
• 1,2,3,4,5,6,7,8, 9