Which of the following muscles are likely to be organs of proprioception instead of producers of motion?
Because of their small size and lack of mechanical advantage, it has been proposed that the rotatores are likely to be organs of proprioception instead of producers of motion
Which of the following statements is true regarding the suboccipital and deep neck muscles?
The rectus capitis posterior major arises from the spinous processes of C2 and inserts into the lateral part of the inferior nuchal line. The rectus capitis posterior minor arises from the posterior tubercle of the posterior arch of C1 and inserts into the medial part of the inferior nuchal line. The obliquus capitis inferior arises from the spinous processes of C2 and inserts into the transverse process of C1. The obliquus capitis superior arises from the transverse process of C1 and inserts into the occipital bone between the nuchal lines. The suboccipital muscles are innervated by the dorsal rami of C1
ALL of the following extend the atlanto-occipital joint EXCEPT
The longus capitis flexes but does not extend the atlanto-occipital joint
The suboccipital triangle is composed of
The suboccipital triangle is the deep triangular area between the rectus capitis posterior major and the superior and inferior oblique muscles. The boundaries and course of the suboccipital triangle include the rectus capitis posterior major, the superior oblique, and the inferior oblique. The floor is formed by the atlanto-occipital membrane and posterior arch of C1. The roof is formed by the semispinalis capitis. The suboccipital triangle contains the vertebral artery and suboccipital nerve
ALL of the following are innervated by dorsal rami EXCEPT
The lesser occipital nerve, which is composed of ventral rami of C2 and C3, innervates the skin of the neck and scalp
Which of the following statements is correct?
The spinal cord is enlarged in the lumbosacral region for innervation of the lower limbs
Which of the following is NOT true in adults?
The spinal cord is enlarged in two regions for innervation of the limbs. The tapering end of the spinal cord may terminate as high as T12 or as low as L3. The first cervical nerves lack dorsal roots in 50% of people. The coccygeal nerve may be absent. The terminal filum is the vestigial remnant of the caudal part of the spinal cord that was in the tail of the embryo
Which of the following is contained in the extradural (epidural) space?
Fat (loose connective tissue) is contained in the extradural (epidural) space
All of the following are contained in the subarachnoid (leptomeningeal) space EXCEPT
CSF, arachnoid trabeculae, segmental medullary arteries, radicular arteries, and spinal arteries are located in the subarachnoid (leptomeningeal) space. The internal vertebral venous plexus is located in the extradural (epidural) space
Which of the following does NOT give rise to arteries supplying the spinal cord?
The vertebral, ascending cervical, deep cervical, intercostal, lumbar, and lateral sacral arteries give rise to arteries supplying the spinal cord
Which of the following is true?
There are paired posterior spinal arteries
Which of the following is true?
Veins of the spinal cord are distributed in a similar fashion to that of spinal arteries
All of the following are contained in typical spinal nerves EXCEPT
Typical spinal nerves do not contain parasympathetic fibers
Which of the following is not true regarding the parasympathetic nervous system?
The postsynaptic neurons of the parasympathetic nervous system emit acetylcholine
Postsynaptic sympathetic fibers that ultimately innervate the body wall and limbs do which of the following?
Postsynaptic sympathetic fibers that ultimately innervate the body wall and limbs pass from the sympathetic trunks to adjacent ventral rami through gray rami communicantes
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