What is a plexus nervous system?

Anatomical terms of neuroanatomy. A nerve plexus is a plexus (branching network) of intersecting nerves. A nerve plexus is composed of afferent and efferent fibers that arise from the merging of the anterior rami of spinal nerves and blood vessels.

What are the four nerve plexuses and their functions?

The cervical plexus supplies nerves to the posterior head and neck, as well as to the diaphragm. The brachial plexus supplies nerves to the arm. The lumbar plexus supplies nerves to the anterior leg. The sacral plexus supplies nerves to the posterior leg.

What do the ganglia and plexus control?

Ganglia often interconnect with other ganglia to form a complex system of ganglia known as a plexus. Ganglia provide relay points and intermediary connections between different neurological structures in the body, such as the peripheral and central nervous systems.

What is the function of the sacral plexus in the nervous system?

The sacral plexus (plexus sacralis) is a nerve plexus that provides motor and sensory nerves for the posterior thigh, most of the lower leg, the entire foot, and part of the pelvis (see the following image).

How many plexus are in the body?

Plexuses. The four primary nerve plexuses are the cervical plexus, brachial plexus, lumbar plexus, and the sacral plexus.

What muscles does the cervical plexus innervate?

The cervical plexus is formed from the anterior primary rami of C1–C4, deep to the sternocleidomastoid muscle and in front of the scalenus medius and levator scapulae muscles. Sensory branches include the greater and lesser occipital nerves, great auricular nerve, cutaneous cervical nerves, and supraclavicular nerves.

Which part of the nervous system is responsible for voluntary movement?

The somatic nervous system
The somatic nervous system is a component of the peripheral nervous system associated with the voluntary control of the body movements via the use of skeletal muscles.

What is the purpose of ganglia?

Ganglia are clusters of nerve cell bodies found throughout the body. They are part of the peripheral nervous system and carry nerve signals to and from the central nervous system.

Is there Meissner plexus in esophagus?

The myenteric plexus, also known as Auerbach’s plexus, is located between the longitudinal and circular muscle layers of the esophagus, stomach, and small and large intestine. The submucosal plexus, also known as Meissner’s plexus, is situated in the submucosal region between the circular muscle and mucosa.

What nerve is the major branch of the cervical plexus?

The transverse cervical nerve arises from C2 and C3 and branches off the cervical plexus posterior to the sternocleidomastoid where it penetrates the deep cervical fascia and divides under the platysma into ascending and descending branches, providing sensation to the anterior and lateral neck.

What does S1 and S2 nerve control?

S1 affects the hips and groin area. S2 affects the back of the thighs. S3 affects the medial buttock area.

How are plexus formed?

Some ventral rami merge with adjacent ventral rami to form a nerve plexus, a network of interconnecting nerves. Nerves emerging from a plexus contain fibers from various spinal nerves, which are now carried together to some target location. Major plexuses include the cervical, brachial, lumbar, and sacral plexuses.