carotid sheath
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Related to carotid sheath: recurrent laryngeal nerve
sheath
[shēth]a tubular case or envelope.
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, vagus nerve, and sympathetic nerves supplying the head.
connective tissue sheath of Key and Retzius endoneurium.
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 endoneurium.
lamellar sheath the perineurium.
medullary sheath myelin sheath.
myelin sheath (nerve 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 (see saltatory conduction).
pial sheath the innermost of the three sheaths of the optic nerve.
root sheath the epidermic layer of a hair follicle.
sheath of Schwann neurilemma.
synovial sheath synovial membrane lining the cavity of a bone through which a tendon moves.
tendon sheath a lubricated fibrous or synovial layer of tissue in which the tendon is housed and through which it moves.
ca·rot·id sheath
[TA]the dense fibrous investment of the carotid artery, internal jugular vein, and vagus nerve on each side of the neck, deep to the sternocleidomastoid muscle; the layers of cervical fascia blend with it.
Synonym(s): vagina carotica [TA]
carotid sheath
the fibrous tissue enclosing the carotid artery, jugular vein, and vagus nerve on each side of the neck.
ca·rot·id sheath
(kă-rot'id shēth) [TA]The dense fibrous investment of the carotid artery, internal jugular vein, and vagus nerve on each side of the neck, deep to the sternocleidomastoid muscle; the layers of cervical fascia blend with it.
Synonym(s): vagina carotica [TA] .
Synonym(s): vagina carotica [TA] .
ca·rot·id sheath
(kă-rot'id shēth) [TA]Dense fibrous investment of carotid artery, internal jugular vein, and vagus nerve on each side of the neck.
carotid
relating to the carotid artery, the principal artery of the neck. See Table 9.
carotid body
a small neurovascular structure lying in the bifurcation of the common carotid arteries, containing chemoreceptors that monitor oxygen content in blood and help to regulate respiration. Called also glomus caroticum.
carotid body tumors
usually unilateral nonfunctional adenoma, chemodectoma, nonchromaffin paraganglioma, or locally invasive carcinoma which may cause deviation of the trachea.
carotid canal
transmits the internal carotid artery to the cranial cavity through the pars petrosa of the temporal bone.
carotid sheath
contains the common carotid artery, internal jugular vein and vagosympathetic trunk.
carotid sinus
a dilatation of the proximal portion of the internal carotid or distal portion of the common carotid artery, containing in its wall pressoreceptors which are stimulated by changes in blood pressure.
carotid sinus reflex
slowing of the heart rate when pressure is applied over the carotid sinus.
carotid sinus syndrome
syncope sometimes associated with convulsive seizures due to overactivity of the carotid sinus reflex.
sheath
1. a tubular case or envelope.
2. vernacular for prepuce.
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.