Page 223 - Anatomy and Physiology of Farm Animals, 8th Edition

208 / Anatomy and Physiology of Farm Animals

Table 10-3. Nerves of Lumbosacral Plexus
VetBooks.ir Nerve Muscles Innervated Cutaneous Distribution
Middle and deep gluteal, tensor
No sensory fibers
Cranial gluteal
fasciae latae
Caudal gluteal Superficial gluteal No sensory fibers
Parts of middle gluteal,
semitendinosus, biceps femoris in horse
Femoral Sartorius Medial aspect of thigh
Quadriceps femoris
Iliopsoas
Obturator Adductor No sensory fibers
Gracilis
Pectineus
Obturator externus
Sciatic Semitendinosus et semimembranosus Sensory fibers arise from
Biceps femoris distal branches (fibular &
tibial nn.)
Obturator internus
Gemelli
Quadratus femoris
Common Tibialis cranialis Dorsal metatarsus and
Fibular Extensor digitorum longus et lateralis pastern/foot

Fibularis tertius
Tibial Gastrocnemius Caudal crus, plantar
Flexor digitorum superficialis et metatarsus, pastern/foot
profundus
Tibialis caudalis
Popliteus

As a consequence, the motor limb of the Sympathetic Nervous System
ANS is functionally and anatomically
divided into two parts. The sympathetic Sympathetic nerve fibers arise from tho-
division of the ANS prepares the organism racic and lumbar segments of the spinal
to meet a stress by producing a combina- cord, thus the sympathetic division is some-
tion of physiologic changes that increase times called the thoracolumbar division.
available fuel molecules, blood flow to Preganglionic sympathetic neurons have
muscle, and cardiac output while simulta- their cell bodies in a small lateral horn of
neously decreasing digestive processes. the spinal cord gray matter, between dorsal
The parasympathetic division of the ANS and ventral horns. The myelinated axons of
is in many respects the opposite of the these fibers leave via the ventral root, enter
sympathetic division. Parasympathetic the spinal nerve, and then depart from it
activity leads to digestion and storage of just peripheral to the intervertebral fora-
fuel molecules and acts to bring the organ- men to join a longitudinal chain of auto-
ism to a state of rest. The physiologic nomic ganglia. One string of these ganglia
effects of the two divisions are covered lies on each side of the vertebral column.
more completely in Chapter 11. Each receives preganglionic fibers from the