Where is Internal ear Located? What are its Parts? Location: Internal ear is located in the petrous part of the temporal bone. Parts of internal ear: Internal ear consists of two parts:Read More…
09Jun/18
Tympanic Cavity
Where is Tympanic cavity/midle ear located? Whatis its shape and dimensions? Location: The middle ear or tympanic cavity is a narrow slit-like air-filled cavity located inside the petrous part of the temporalRead More…
Lacrimal Apparatus
Enumerate the Components of Lacrimal apparatus. The components of lacrimal apparatus include structures involved in tear production and drainage. They are: Lacrimal gland. Lacrimal ducts. Conjunctival sac. Lacrimal puncta and lacrimal canaliculi.Read More…
Ciliary Ganglion
Introduction Ciliary Ganglion It is a Parasympathetic ganglion. It is a relay station for fibers supplying sphincter pupillae and ciliaris muscle It is topographically connected to nasociliary nerve (branch of ophthalmic divisionRead More…
Ophthalmic Artery
Origin of Ophthalmic Artery It is a branch of internal carotid artery. Origin: It arises when the internal carotid artery emerges through the roof of the cavernous sinus, medial to anterior clinoidRead More…
Ophthalmic nerve
Course of Ophthalmic Nerve Ophthalmic nerve is the 1st division of trigeminal nerve. It is a pure sensory nerve. It commences from the anterior aspect of trigeminal ganglion. It passes along the lateral wallRead More…
Brain – Arterial Supply
Introduction Brain is one of the most metabolically active organs of the body. Although it constitutes only 2% of the total body weight, it receives 17-20% of the total cardiac output andRead More…
Hypoglossal Nerve
Introduction Hypoglossal nerve is the 12th cranial nerve. It is purely motor nerve. Origin: Its nucleus is located in the medulla in the lower part of the floor of the fourth ventricle.Read More…
Accessory Nerve
Introduction Accessory nerve is the 11th cranial nerve. It has two parts: Spinal and cranial. Origin: Spinal part aries from the spinal nucleus of accessory nerve located in upper 4-5 cervical segments ofRead More…
Vagus Nerve
Introduction Vagus nerve is the 10th cranial nerve. It is a mixed (sensory and motor) nerve. Origin: Its nuclei viz. nucleus ambiguus, dorsal motor nucleus of vagus and nucleus of tractus solitariousRead More…