Iiilocation Of The Major Motor And Sensory Nuclei Of The Spinal Cord

A. The ciliospinal center of Budge, from C-8 to T-2, mediates the sympathetic innervation of the eye.

B. The intermediolateral cell column, from C-8 to L-3, mediates the entire sympathetic innervation of the body.

C. The nucleus dorsalis of Clark, from C-8 to L-3, gives rise to the dorsal spinocerebellar tract.

D. The parasympathetic nucleus, from S-2 to S-4

E. The spinal accessory nucleus, from C-l to C-6

F. The phrenic nucleus, from C-3 to C-6

IV. THE CAUDA EQUINA. Motor and sensory roots (L-2 to Co) that are found in the subarachnoid space below the conus medullaris form the cauda equina. They exit the vertebral canal through the lumbar intervertebral and sacral foramina.

V. THE MYOTATIC REFLEX (see Figure 6-1) is a monosynaptic and ipsilateral muscle stretch reflex (MSR). Like all reflexes, the myotatic reflex has an afferent and an efferent limb. Interruption of either limb results in areflexia.

A. The afferent limb includes a muscle spindle (receptor) and a dorsal root ganglion neuron and its la fiber.

B. The efferent limb includes a ventral horn motor neuron that innervates striated muscle (effector).

C. The five most commonly tested MSRs are listed in Table 6-1.

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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