Download - (Gen Ana) Muscles of the Back
-
8/3/2019 (Gen Ana) Muscles of the Back
1/43
Muscles of the Back
Ella Carmela Chavez
Mae Nen Vedeja
Zara Denisse GarciaMardred Marcelo
-
8/3/2019 (Gen Ana) Muscles of the Back
2/43
Superficial Group
Trapezius Muscle
It is the large superficial muscle that extends
longitudinally from the occipital bone to the
lower thoracic vertebrae and laterally to thespine of the scapula (shoulder blade). Its
functions are to move the scapulae and support
the arm.
-
8/3/2019 (Gen Ana) Muscles of the Back
3/43
Trapezius
-
8/3/2019 (Gen Ana) Muscles of the Back
4/43
Superficial Group
Trapezius Muscle
The Trapezius Muscle resembles a trapezoid or
a diamond-shaped quadrilateral.
ORIGIN: external occipital protuberance.
INSERTION: spine of scapula.
ACTION: elevates and depresses the scapula
(depending on which part of the musclecontracts); rotates the scapula superiorly;
retracts scapula
-
8/3/2019 (Gen Ana) Muscles of the Back
5/43
Superficial Group
Latissimus Dorsi
Meaning 'broadest muscle of theback
. It is the larger, flat, dorso-lateral muscle on the
trunk, posterior to the arm, and partly covered
by the trapezius on its median dorsal region.
-
8/3/2019 (Gen Ana) Muscles of the Back
6/43
Latissimus Dorsi
-
8/3/2019 (Gen Ana) Muscles of the Back
7/43
Superficial Group
Latissimus Dorsi Muscle
ORIGIN: vertebral spines from T7 to the sacrum,
posterior third of the iliac crest, lower 3 or 4
ribs, sometimes from the inferior angle of thescapula
INSERTION: floor of the intertubercular groove
of humerus.
-
8/3/2019 (Gen Ana) Muscles of the Back
8/43
Superficial Group
Latissimus Dorsi Muscle
ACTION: responsible for extension, adduction,
transverse extension, flexion from an extended
position, and (medial) internal rotation of theshoulder joint. It also has a synergistic role in
extension and lateral flexion of the lumbar
spine.
-
8/3/2019 (Gen Ana) Muscles of the Back
9/43
Superficial Group
Rhomboid Major Muscle
A muscle on the back that connects
the scapula with the vertebrae of the spinal
column. It acts together with the rhomboidminor to keep the scapula pressed against the
thoracic wall and to retract the scapula toward
the vertebral column.
It lies deep to trapezius but superficial to the
long spinal muscles.
-
8/3/2019 (Gen Ana) Muscles of the Back
10/43
Rhomboid Major
-
8/3/2019 (Gen Ana) Muscles of the Back
11/43
Superficial Group
Rhomboid Major Muscle
ORIGIN: spines of vertebrae T2-T5
INSERTION: medial border of the scapula
inferior to the spine of the scapula
ACTION: The rhomboid major helps to hold the
scapula (and thus the upper limb) onto the
ribcage. The rhomboids also acts to retract thescapula, pulling it towards the vertebral column.
-
8/3/2019 (Gen Ana) Muscles of the Back
12/43
Superficial Group
Rhomboid Minor Muscle
A small skeletal muscle on the back that
connects the scapula with the vertebrae of the
spinal column.
It lies deep to trapezius but superficial to the
long spinal muscles.
-
8/3/2019 (Gen Ana) Muscles of the Back
13/43
Rhomboid Minor
-
8/3/2019 (Gen Ana) Muscles of the Back
14/43
Superficial Group
Rhomboid Minor Muscle
ORIGIN: inferior end of the ligamentum nuchae,
spines of vertebrae C7 and T1.
INSERTION: medial border of the scapula at the
root of the spine of the scapula.
ACTION: retracts, elevates and rotates the
scapula.
-
8/3/2019 (Gen Ana) Muscles of the Back
15/43
Superficial Group
Levator Scapulae Muscle
A skeletal muscle situated at the back and side
of the neck.
As the name suggests, its main function is to lift
the scapula.
-
8/3/2019 (Gen Ana) Muscles of the Back
16/43
Levator Scapulae
-
8/3/2019 (Gen Ana) Muscles of the Back
17/43
Superficial Group
Levator Scapulae Muscle
ORIGIN: transverse processes of C1-C4
vertebrae.
INSERTION: medial border of the scapula from
the superior angle to the spine.
ACTION: elevates the scapula.
-
8/3/2019 (Gen Ana) Muscles of the Back
18/43
Superficial Group
-
8/3/2019 (Gen Ana) Muscles of the Back
19/43
Innervations and Blood Supply
-
8/3/2019 (Gen Ana) Muscles of the Back
20/43
Intermediate Group
Serratus Posterior Superior Muscle
a thin, quadrilateral muscle, situated at the
upper and back part of the thorax.
-
8/3/2019 (Gen Ana) Muscles of the Back
21/43
Serratus Posterior Superior
-
8/3/2019 (Gen Ana) Muscles of the Back
22/43
Intermediate Group
Serratus Posterior Superior Muscle
ORIGIN: ligamentum nuchae, spines of
vertebrae C7 and T1-T3.
INSERTION: ribs 2-5.
ACTION: elevates the upper ribs.
-
8/3/2019 (Gen Ana) Muscles of the Back
23/43
Intermediate Group
Serratus Posterior Inferior Muscle
The muscle lies at the junction of the thoracic
and lumbar regions.
It is situated at the junction of the thoracic and
lumbar regions: it is of an irregularly
quadrilateral form, broader than the serratus
posterior superior muscle, and separated fromit by a wide interval.
-
8/3/2019 (Gen Ana) Muscles of the Back
24/43
Serratus Posterior Inferior
-
8/3/2019 (Gen Ana) Muscles of the Back
25/43
Intermediate Group
Serratus Posterior Inferior
ORIGIN: thoracolumbar fascia, spines of
vertebrae T11-T12 and L1-L2.
INSERTION: ribs 9-12.
ACTION: pulls down lower ribs.
-
8/3/2019 (Gen Ana) Muscles of the Back
26/43
Intermediate Group
-
8/3/2019 (Gen Ana) Muscles of the Back
27/43
Deep Group
Splenius Capitis
Splenius Cervicis
Multifidus Muscle Semispinalis Muscles
Spinal Erectors (Erector Spinae)
Iliocostalis
Longissimus
Spinalis
-
8/3/2019 (Gen Ana) Muscles of the Back
28/43
Deep Group
Splenius Cervicis
Splenius Capitis
Are broad, straplike muscle in the back of the
neck. It pulls on the base of the skull from
vertebrae in the neck and upper thorax.
Derived from the Latin words Splenion
meaning bandage. ACTION: extends and laterally bends the neck
and head, rotates head to the same side
-
8/3/2019 (Gen Ana) Muscles of the Back
29/43
Splenius Muscles
-
8/3/2019 (Gen Ana) Muscles of the Back
30/43
Deep Group
Spinal Erectors
Iliocostalis
The iliocostalis originates from
the sacrum, erector spinae
aponeurosis and iliac crest.
ACTION: extends and laterally bends the
trunk and neck.
-
8/3/2019 (Gen Ana) Muscles of the Back
31/43
Iliocostalis Lumborum
Iliocostalis ThoracisIliocostalis Cervicis
-
8/3/2019 (Gen Ana) Muscles of the Back
32/43
Deep Group
Spinal Erectors
Longissimus Muscles
It is the longest subdivision of the erector
spinae that extends forward into thetransverse processes of the posterior cervical
vertebrae.
ACTION: extends and laterally bends thetrunk, neck and head.
-
8/3/2019 (Gen Ana) Muscles of the Back
33/43
Longissimus Thoracis
Longissimus CervicisLongissimus Capitis
-
8/3/2019 (Gen Ana) Muscles of the Back
34/43
Deep Group
Spinal Erectors
Spinalis
Portion of the erector spinae located nearest
to the spine.
It is divided into three parts.
ACTION: extends and laterally bends trunk
and neck.
-
8/3/2019 (Gen Ana) Muscles of the Back
35/43
Spinalis Dorsi
Spinalis CervicisSpinalis Capitis
-
8/3/2019 (Gen Ana) Muscles of the Back
36/43
Erector Spinae Muscles
-
8/3/2019 (Gen Ana) Muscles of the Back
37/43
Deep Group
Semispinalis Muscles
Semispinalis Dorsi
consists of thin, narrow, fleshy fasciculi, interposed
between tendons of considerable length. ACTION: extends the trunk and laterally bends the
trunk, rotates the trunk to the opposite side.
-
8/3/2019 (Gen Ana) Muscles of the Back
38/43
Deep Group
Semispinalis Muscles
Semispinalis Cervicis
Thicker than the Semispinalis Dorsi, arises by a
series of tendinous and fleshy fibers from thetransverse processes of the upper five or sixthoracis
vertebrae, and is inserted into the cervical spinous
processes, from the axis to the fifth inclusive.
ACTION: extends the trunk and laterally bends thetrunk, rotates the trunk to the opposite side.
-
8/3/2019 (Gen Ana) Muscles of the Back
39/43
Deep Group
Semispinalis Muscles
Semispinalis Capitis
Situated at the upper and back part of the neck, deep
to the Splenius, and medial to the Longissimuscervicis and capitis.
ACTION: extends the trunk and laterally bends the
trunk, rotates the trunk to the opposite side.
-
8/3/2019 (Gen Ana) Muscles of the Back
40/43
Semispinalis Dorsi
Semispinalis CervicisSemispinalis Capitis
-
8/3/2019 (Gen Ana) Muscles of the Back
41/43
Deep Group
Multifidus Muscle
consists of a number of fleshy and
tendinous fasiculi, which fill up the groove on
either side of the spinous process of thevertebrae, from the sacrum to the axis.
Very thin muscle.
ACTION: Stabilizes vertebrae in localmovements of vertebral column
-
8/3/2019 (Gen Ana) Muscles of the Back
42/43
Multifidus Muscle
-
8/3/2019 (Gen Ana) Muscles of the Back
43/43
END