Final 1 Flashcards
What is the incidence of lumbar ribs in the population?
over 7% of the population demonstrates lumbar ribs
What is characteristic of lumbarization of S1?
the failure of synostosis between S1 and S2, squaring of the vertebral body of S1 and flaring of the sacral ala
What is the incidence of sacralization of L5 in the population?
41% to 85%
Which segment demonstrates the greatest morphological variation along the spine?
L5
What is the incidence of variation within the sacrococcygeal region in the population?
up to 14%
The trapezius is innervated by what nerve?
the 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
Which of the muscles of the true back is innervated by the thoracodorsal nerve?
latissimus dorsi
What forms the thoracodorsal nerve innervating the latissimus dorsi?
ventral rami from C6-C8
Which of the muscles of the true back are innervated by the dorsal scapular nerve?
levator scapulae, rhomboid major, rhomboid minor
What forms the dorsal scapular nerve?
the ventral ramus of C5
What muscles lie just beneath the trapezius in the neck?
splenius capitis and splenius cervicis
What does the word “splenius” mean?
it is the Greek word for bandage
What is the innervation of the splenius capitis?
dorsal rami of middle cervical spinal nerves (C3-C5 cord levels)
What is the innervation of the spenius cervicis?
dorsal rami of lower cervical spinal nerves (C5-C7 cord levels)
