Anatomy
Introduction
· Hilton's law: The nerve supplying a joint also supplies the muscles that move the joint and the skin covering the insertion of such muscles.
Introduction
· Hilton's law: The nerve supplying a joint also supplies the muscles that move the joint and the skin covering the insertion of such muscles.
1. Unipolar (pseudounipolar) neurons - Have
one process, which divides into a central branch that functions as an axon and
a peripheral branch that serves as a dendrite.Are called pseudounipolar because
they were originally bipolar. The two processes fuse during development to form
a single process that bifurcates at a distance from the cell body.Are sensory neurons
of the PNS and found in spinal and cranial nerve ganglia.
2. Bipolar neurons - Have two processes (one
dendrite and one axon); are sensory; and are found in the olfactory epithelium, the retina, and the
inner ear.
3. Multipolar neurons - Have several dendrites
and one axon and are most common in the CNS e.g., motor cells in anterior and lateral horns
of the spinal cord, autonomic ganglion cells.
·
Lymphatic Vessels are absent in the brain, spinal cord,
eyeballs, bone marrow, splenic pulp, hyaline cartilage, nails, and hair.
·
Dorsal root ganglia
consist of cell bodies of the unipolar or pseudounipolar neurons and have no
synapses.
·
The lateral horns
are found in the gray matter of the spinal cord between T1 and L2 and also
between S2 and S4.
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