Myology of Back Flashcards
The trapezius is innervated by what nerve?
spinal accessory nerve
What forms the spinal accessory nerve innervating the trapezius?
C1-C5 cord levels contribute to the spinal root of the spinal accessory nerve
The latissiums dorsi is innervated by what nerve?
thoracodorsal nerve
What forms the thoracodorsal nerve innervating the latissimus dorsi?
ventral rami of C6-C8
What forms the dorsal scapular nerve?
ventral ramus of C5
What is the innervation of the splenius capitis?
dorsal rami of middle cervical spinal nerves (C3-C5 cord levels)
Splenius cervicis will attach to what locations on the spine?
lateral mass of C1 & posterior tubercle of transverse process on C1-C4
Which muscles are identified as erector spinae or sacrospinalis muscles?
iliocostalis, longissiumus, spinalis
What is the innervation of iliocostalis lumborum?
dorsal rami of lower thoracic and all lumbar spinal nerves
What osseous parts of the vertebral column serve as an origin to the iliocostalis thoracis?
none
What is the insertion for the iliocostalis thoracis?
costal angles of the upper 6-7 ribs,
transverse process of C7
What osseous parts of the vertebral column serve an origin to the longissimus thoracis?
accessory process & transverse processes of L1-L5,
spinous processes of L3-L5,
medial sacral crest of S1-S3
What is the innervation of the longissimus cervicis?
dorsal rami of C4-C8 (C4-C8 cord levels),
T1-T2 spinal nerves (T1-T2 cord levels
What osseous parts of the vertebral column serve as an origin to the spinalis thoracis?
spinous processes of T11 & T12, L1 & L2
Which muscles are identified as transversospinalis muscles?
semispinalis, multifidis, rotators
How many vertebrae can be attached to a single segment by transversospinalis muscles?
as many as 9 vertebrae
What segment will represent the lowest attachment site for the semispinalis thoracis?
T12
What osseous parts of the vertebral column serve as an origin to the semispinalis cervicis?
transverse tubercles of T1-T5,
or T6 & articular process of C4-C7
Which of the cervical intertransversarii is inntervated by dorsal rami of cervical spinal nerves?
posterior medial belly, cervical intertransversarii
What is the origin of the medial belly of the lumbar intertransversarii?
accessory process of transverse process of L1-L4
mammillary process of superior articular process of L1-L4
Which muscle group is innervated by both dorsal rami and ventral rami of spinal nerves?
intertransversarii
Based on the density of muscle spindles, what is the proposed function of the intertransversarii?
acts as a proprioceptive transducer in conjunction with interspinalis to coordinate the smooth movement of the spine and to maintain appropriate posture
What is the origin of the longus colli?
vertebral bodies of C5-C6, T1-T3,
& anterior tubercles of transverse processes C3-C5
What is the origin of the rectus capitis anterior?
lateral mass & costal element of the transverse process of C1
