optic canal


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canal

 [kah-nal´]
a relatively narrow tubular passage or channel.
adductor canal Hunter's canal.
Alcock's canal a tunnel formed by a splitting of the obturator fascia, which encloses the pudendal vessels and nerve.
alimentary canal see alimentary canal.
anal canal the terminal portion of the alimentary canal, from the rectum to the anus.
atrioventricular canal the common canal connecting the primordial atrium and ventricle; it sometimes persists as a congenital anomaly.
birth canal the canal through which the fetus passes in birth.
carotid canal one in the pars petrosa of the temporal bone, transmitting the internal carotid artery to the cranial cavity.
cervical canal the part of the uterine cavity lying within the cervix.
condylar canal an occasional opening in the condylar fossa for transmission of the transverse sinus; called also posterior condyloid foramen.
canal of Corti a space between the outer and inner rods of Corti.
femoral canal the cone-shaped medial part of the femoral sheath lateral to the base of Gimbernat's ligament.
haversian canal any of the anastomosing channels of the haversian system in compact bone, containing blood and lymph vessels, and nerves.
Hunter's canal a fascial tunnel in the middle third of the medial part of the thigh, containing the femoral vessels and saphenous nerve. Called also adductor canal.
hypoglossal canal an opening in the occipital bone, transmitting the hypoglossal nerve and a branch of the posterior meningeal artery; called also anterior condyloid foramen.
infraorbital canal a small canal running obliquely through the floor of the orbit, transmitting the infraorbital vessels and nerve.
inguinal canal the oblique passage in the lower anterior abdominal wall on either side, through which passes the round ligament of the uterus in the female, and the spermatic cord in the male.
medullary canal
optic canal a passage for the optic nerve and ophthalmic artery at the apex of the orbit; called also optic foramen.
pulp canal root canal.
root canal that part of the pulp cavity extending from the pulp chamber to the apical foramen. Called also pulp canal.
sacral canal the continuation of the spinal canal through the sacrum.
Schlemm's canal venous sinus of sclera.
semicircular c's see semicircular canals.
spinal canal (vertebral canal) the canal formed by the series of vertebral foramina together, enclosing the spinal cord and meninges.
Volkmann's c's canals communicating with the haversian canals, for passage of blood vessels through bone.

op·tic ca·nal

[TA]
the short canal through the lesser wing of the sphenoid bone at the apex of the orbit that gives passage to the optic nerve and the ophthalmic artery.

op·tic ca·nal

(op'tik kă-nal') [TA]
The short canal through the lesser wing of the sphenoid bone at the apex of the orbit that gives passage to the optic nerve and the ophthalmic artery.
Synonym(s): canalis opticus [TA] , optic foramen.
References in periodicals archive ?
In the literature, duplication of the optic canal has been reported several times [5, 7, 11, 14, 15].
In the present study, bilateral presence of two similar bony bars arising from the sides of the body of sphenoid towards the lesser wing of sphenoid bone thus creating one extra foramina below the optic canal. Such variation was not reported before in any other studies.
Unlike corticosteroids and EPO, optic canal decompression serves to remove the primary injurious agent that causes secondary axonal loss rather than decreasing the necrosis of the primary contusion or interfering with the ongoing pathological process [13, 54].
(2) Our case emphasizes the significance of anatomical variations, particularly bony dehiscence over the optic canal. These defects are rare but predict a poor prognosis.
After the bone between the optic canal and the anterior clinoid process has been removed, the clinoid is anchored to bone only through the optic strut.
Positioned like that, the optic strut separates optic canal from the medial portion of superior orbital fissure.
Anterior clinoidectomy provides improved exposure of structures in and around the optic nerve, ICA and optic canal. It also enhances mobilization of the intracranial ICA and optic nerve with less brain retraction (Matsuyama et al., 1997; Seoane et al., 1998; Sato et al., 2001).
High incidence of optic canal involvement in tuberculum sellae meningiomas: Rationale for aggressive skull base approach.
Bekerman, "Quantitative relations between the eyeball, the optic nerve, and the optic canal important for intracranial pressure monitoring," Head & Face Medicine, vol.
Also the frequency of insertion of the main and/or accessory sphenoid septa to the optic canal and the carotid canal varies significantly.
A cranial computed tomography (CT) scan was performed and a mass around the left orbital apex invading the superior orbital fissure and the optic canal with intradural growth could be seen (Fig.
This study aimed to investigate the surgical indications of exploring the optic canal and visual prognostic factors in the neurosurgical treatment of TSMs.