Module 4 Muscles Flashcards
Sternocleidomastoid - Innervation
Spinal accessory nerve (CN XI), C2, 3
Sternocleidomastoid - Origin
Sternal head: top of the manubrium
Clavicular head: medial 1/3 of the clavicle
Sternocleidomastoid - Insertion
Mastoid process of the temporal bone
And
The lateral portion of superior nuchal line of the occiput
Sternocleidomastoid - actions
Unilaterally:
LATERALLY FLEX the head and neck to the same side
ROTATE the head and neck to the opposite side
Bilaterally:
FLEX the neck
Assist to ELEVATE the ribcage during inhalation
Sternocleidomastoid - palpation
Supine - contralaterally rotate and lift head and neck of the table
Scalenes - Innervation
C(3), 4-8
Scalenes - SIN # to help remember origin and insertions
136 127 267
Ant Mid Pos
(1st rib, C3-C6, 1st rib, C2-C7, 2nd rib, C6-C7)
Scalenes - Origin
Anterior:
Transverse processes of C3 to C6
Middle:
Transverse processes of C2 to C7
Posterior:
Transverse processes of C6 to C7
Scalenes - Insertion
Anterior:
1st Rib
Middle:
1st Rib
Posterior:
2nd Rib
Scalenes - Actions
Unilaterally:
LATERALLY FLEX the head and neck to the same side (all 3)
ROTATE the head and neck to the opposite side (all 3)
Bilaterally:
FLEX the head and neck (anterior only)
ELEVATE the ribs during inhalation (all 3)
Scalenes - Palpation
Drop laterally off the SCM and have client take in short burst inhales through the nose
Levator Scapulae - Innervation
Cervical and dorsal scapular nerves
Levator scapulae - origin
Transverse processes of C1 to C4
Levator scapula - insertion
Medial border of the scapula between the superior angle and the superior portion of the spine of the scapula
Levator Scapulae - Actions
Unilaterally:
ELEVATE & DOWNWARDLY ROTATE the scapulothoracic joint
LATERALLY FLEX the head and neck to same side
ROTATE the head and neck to same side
Bilaterally:
EXTEND the head and neck
Splenius Capitus - Innervation
Cervical nerve
Splenius Capitus - Origin
Inferior 1/2 of ligamentum nuchae and spinous processes of C7 to T4
Splenius Capitus - Insertion
Mastoid process and lateral portion of superior nuchal line
Splenius Capitus - Actions
Unilaterally:
ROTATE the head and neck to same side
LATERALLY FLEX the head and neck to same side
Bilaterally:
EXTEND the head and neck
Trapezius - innervation
Spinal portion of cranial nerve XI (spinal accessory nerve) and ventral ramus C2, 3, 4
Trapezius - Origin
External occipital protuberance,
Medial portion of superior nuchal line of the occiput,
Ligamentum nuchae, and
Spinous processes of C7 through T12
Trapezius - insertion
Lateral 1/3 of clavicle
Acromion process
Spine of scapula
Trapezius - Actions
(upper fibres: 5, middle fibres: 2, lower fibres: 2)
UPPER FIBRES
Bilaterally:
EXTEND the head and neck
Unilaterally:
LATERALLY FLEX the head and neck to same side
ROTATE the head and neck to opposite side
ELEVATE the scapulothoracic joint (scapula)
UPWARDLY ROTATE the scapulothoracic joint
MIDDLE FIBRES
ADDUCT the scapulothoracic joint
STABILIZE the scapulothoracic joint
LOWER FIBRES
DEPRESS the scapulothoracic joint
UPWARDLY ROTATE the scapulothoracic joint
Rhomboids - Major and Minor - innervation
Dorsal scapular nerve
