Muscles of the Neck ( Module 4 ) Flashcards
SCM - Innervation
Spinal Accessory Nerve (CN XI) C2,3
SCM - Origin
Sternal Head:
Top of the manubrium
Clavicular Head:
Medial 1/3 of the clavicle
SCM - Insertion
Mastoid process of the temporal bone
Lateral portion of the superior nuchal line of the occiput
SCM - 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
Scalenes - Innervation
C3-8
Scalenes - Origin
ANTERIOR:
transverse process of C3-C6
MIDDLE:
transverse process of C2-C7
POSTERIOR:
transverse process of C6-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)
SIN # to remember for scalenes
136 127 267
Levator Scapulae - Innervation
Cervical and dorsal scapular nerves
levator Scapulae - Origin
transverse process of C1 - C4
Levator Scapulae - Insertion
Medial border of the scapula between the superior angle and the superior portion of the spine of the scapula
Levator Scapula - Actions
Unilaterally:
ELEVATE the scapula
DOWNWARDLY ROTATE the scapula
LATERALLY FLEX the head and neck to the SAME side
ROTATE the head and neck to the SAME side
Bilaterally:
EXTEND the head and neck
Splenius Capitus - Innervation
Cervical nerve
Splenius capitus - Origin
Inferior 1/2 of the ligamentum nuchae
Spinous process of C7 - T4
Splenius Capitus - Insertion
Mastoid process
Lateral portion of the superior nuchal line
Splenius capitus - Actions
Unilaterally:
ROTATE the head and neck to the SAME side
LATERALLY FLEX the head and neck to the SAME side
Bilaterally:
EXTEND the head and neck
Splenius Cervicis - Innervation
Cervical Nerve
Splenius Cervicis - Origin
Spinous processes of T3 - T6
Splenius Cervicis - Insertion
Transverse processes of C1 - C3