9/29 Questions Flashcards
What is the classic origin of rotator brevis or its homolog?
transverse processes from C3 and each lower vertebra to the dorsal surface of sacrum (C3-C7, T1-T12, L1-L5, sacrum)
What is the classic origin of rotator longus or its homolog?
transverse processes from C4 and each lower vertebra to the dorsal surface of sacrum
What innervates the rotators?
dorsal rami at the level of insertion are believed to do so
Which suboccipital muscle lacks an attachment to the skull?
obliquus capitis inferior
Which nerve will innervate all suboccipital muscles?
the dorsal ramus of C1, the suboccipital nerve
What is the origin of the rectus capitis posterior major?
the spinous tubercle of C2
What is the origin of the rectus capitis posterior minor?
the posterior tubercle of the posterior arch of C1
What is the origin of the obliquus capitis inferior?
C2 spinous process and lamina
What is the insertion of the obliquus capitis inferior?
transverse process of C1
What is the origin of the obliquus capitis superior?
the posterior tubercle of the transverse process of C1
An increase in the density of muscle spindles is most apparent in which suboccipital muscle?
obliquus capitis inferior
What is the result of communication between suboccipital muscles, visual centers and vestibular centers?
coordination of head and eye position
What is the proposed function of the suboccipital muscle group?
postural stabilizers of the atlanto-occipital and atlanto-axial joint
Which suboccipital muscles are known to attach to dura mater?
rectus capitis posterior major
rectus capitis posterior minor
obliquus capitis inferior
Interspinalis is paired in which regions of the spine?
cervical and lumbar regions
At what locations will interspinalis be absent along the spine?
T3-T4 down to T10-T11
Based on the density of muscle spindles what is the proposed function of the interspinalis?
acts as a proprioceptive transducer in conjunction with intertransversarii to coordinate the smooth movement of the spine and to maintain appropriate posture
Which of the cervical intertransversarii is innervated by dorsi 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 L1-L4
mammillary process of superior articular process L1-L4
Which of the lumbar intertransversarii is innervated by dorsal rami of lumbar spinal nerves?
medial belly, lumbar intertransversarii
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 and anterior tubercles of transverse processes C3-C5
What will innervate the longus colli?
ventral rami of C2-C6 or C7 spinal nerves
What will innervate the longus capitis?
the ventral rami of C1-C3 spinal nerves
What is the origin of the rectus capitis anterior?
lateral mass and costal element of the transverse process of C1
What will innervate the rectus capitis anterior?
ventral rami of C1-C2 spinal nerves
What will innervate the rectus capitis lateralis?
the ventral rami of C1-C2 spinal nerves
What is the insertion of the anterior scalene?
ridge and anterior scalene tubercle of the first rib
What will innervate the anterior scalene?
the ventral rami of C2-C6 spinal nerves
What is the insertion of the middle scalene?
between the tubercle and groove for the subclavian artery on the first rib
What will innervate the middle scalene?
the ventral rami of C3-C8 spinal nerves
What is the insertion of the posterior scalene?
outer surface of second rib
What will innervate the posterior scalene?
the ventral rami of C6-C8 spinal nerves
Rotator muscles are typically identified in what region of the spine?
the thoracic region
