choroid plexus

(noun)

A structure in the ventricles of the brain where CSF is produced.

Related Terms

Examples of choroid plexus in the following topics:

  • Cerebrospinal Fluid and Its Circulation

    • Between 50 to 70% of CSF is produced in the brain by modified ependymal cells in the choroid plexus, and the remainder is formed around blood vessels and along ventricular walls.
    • This diagram indicates the (1) posterior medullary velum (2) choroid plexus (3) cisterna cerebellomedullaris of subarachnoid cavity (4) central canal (5) corpora quadrigemina (6) cerebral peduncle (7) anterior medullary velum (8) ependymal lining of ventricle (9) cisterna pontis of subarachnoid cavity

  • Ventricles

    • CSF is produced by modified ependymal cells of the choroid plexus found in all components of the ventricular system except for the cerebral aqueduct and the posterior and anterior horns of the lateral ventricles.

  • Sacral and Coccygeal Plexuses

    • The sacral plexus is the plexus of the three sacral spinal nerves (S2–S4) that arise from the lower back just above the sacrum.
    • The sacral plexus 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.
    • Often, the sacral plexus and the lumbar plexus are considered to be one large nerve plexus, the lumbosacral plexus.
    • The coccygeal plexus originates from the S4, S5, and Co1 spinal nerves.
    • It is interconnected with the lower part of the sacral plexus.

  • Plexuses

    • The plexus extends toward the armpit (axilla).
    • The lumbar plexus is formed by the ventral rami of L1–L5 spinal nerves with a contribution of T12 form the lumbar plexus.
    • This plexus lies within the psoas major muscle.
    • It is interconnected with the lower part of sacral plexus.
    • In addition, the celiac plexus serves the internal organs, and Auerbach's plexus serves the gastrointestinal tract.

  • Autonomic Plexuses

    • The autonomic plexuses include the cardiac plexus, the pulmonary plexus, the esophageal plexus, and abdominal aortic plexus, and the superior and inferior hypogastric plexuses.
    • Cardiac: The cardiac plexus is a plexus of nerves situated at the base of the heart that innervates the heart.
    • The esophageal plexus and the cardiac plexus contain the same types of fibers and are both considered thoracic autonomic plexus(es).
    • Superior hypogastric plexus: The superior hypogastric plexus (in older texts, hypogastric plexus or presacral nerve) is a plexus of nerves situated on the vertebral bodies below the bifurcation of the abdominal aorta.
    • Inferior hypogastric plexus: The inferior hypogastric plexus (pelvic plexus in some texts) is a plexus of nerves that supplies the viscera of the pelvic cavity.

  • Brachial Plexus

    • The brachial plexus is formed by the four lower cervical spinal nerves and the first thoracic spinal nerve.
    • The brachial plexus proceeds through the neck, the axilla (armpit region), and into the arm.
    • Lesions on the brachial plexus can lead to severe functional impairment.
    • The brachial plexus is divided into roots, trunks, divisions, cords, and branches.
    • The right brachial plexus with its short branches, viewed from the front.

  • Injuries to Nerves Emerging from the Brachial Plexus

    • Brachial plexus injuries, or lesions, are caused by damage to those nerves.
    • But in general, brachial plexus lesions can be classified as either traumatic or obstetric.
    • The brachial plexus may be injured by falls from a height on to the side of the head and shoulder, whereby the nerves of the plexus are violently stretched.
    • Cervical (C5-C8) and thoracic (T1) comprise the brachial plexus, which is a nerve plexus that provides sensory and motor function to the shoulders and upper limbs.
    • Describe the effects of injuries to the nerves of the brachial plexus

  • Cervical Plexus

    • The cervical plexus is the plexus of the ventral rami of the first four cervical spinal nerves.
    • The cervical plexus is a plexus of the ventral rami of the first four cervical spinal nerves located from the C1 to C4 cervical segment in the neck.
    • Nerves formed from the cervical plexus innervate the back of the head, as well as some neck muscles.
    • The cervical plexus has two types of branches: cutaneous and muscular.
    • The great auricular nerve originates from the cervical plexus and is composed of branches from spinal nerves C2 and C3.

  • Lumbar Plexus

    • The lumbar plexus is a nerve plexus in the lumbar region of the body that forms part of the lumbosacral plexus.
    • This plexus lies within the psoas major muscle.
    • Nerves of the lumbar plexus serve the skin and the muscles of the lower abdominal wall, the thigh, and external genitals.
    • Femoral nerve: This is the largest and longest of the plexus' nerves.
    • An image of the lumbar plexus with its nerves highlighted in yellow.

  • Nerve and Blood Supply

    • The articular and epiphyseal branches of the neighboring arteries form a periarticular arterial plexus.
    • Numerous vessels from this plexus pierce the fibrous capsule and form a rich vascular plexus in the deeper part of the synovial membrane.