Henle's sheath

Henle's sheath

n.

See endoneurium.

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sheath

1. a tubular case or envelope.

2. vernacular for prepuce.

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adrenal pericapsular sheath

contains a plexus of large nerve trunks with numerous ganglion cells.

arachnoid sheath

the delicate membrane between the pial sheath and the dural sheath of the optic nerve.

carotid sheath

a portion of the cervical fascia enclosing the carotid artery, internal jugular vein, and vagus or vagosympathetic nerve.

carpal tendon s's

sheaths to the tendons of the muscles which course over the carpus.

crural sheath

femoral sheath.

dural sheath

the external investment of the optic nerve.

femoral sheath

the fascial sheath of the femoral vessels.

Henle's sheath

the endoneurium, especially the delicate continuation around the terminal branches of nerve fibers.

lamellar sheath

the perineurium.

medullary sheath, myelin sheath

the sheath surrounding the axon of myelinated nerve cells, consisting of concentric layers of myelin formed in the peripheral nervous system by the plasma membrane of Schwann cells, and in the central nervous system by the plasma membrane of oligodendrocytes. It is interrupted at intervals along the length of the axon by gaps known as nodes of Ranvier. Myelin is an electrical insulator that serves to speed the conduction of nerve impulses.

pial sheath

the innermost of the three sheaths of the optic nerve.

root sheath

the epidermal layer of a hair follicle.

sheath of Schwann

neurilemma.

synovial sheath

a synovial membrane sleeve through which a tendon moves; found commonly where a tendon passes over a joint.