Internal Jugular Vein: Anatomy

INTERNAL JUGULAR VEINThe largest vein in the neck usually) and collects the bloodfrom the brain, from superficial parts of neck and face.FORMATION with levelEND with levelBegins 1/2' below the base of Skull asa direct continuation of sigmoid simussub-clavian vein forming theEnds by joining with thewhich comes out through thebrachio cephalic vein behindposterior compartment of jugularthe Sternal end of clavicle.foramen.COURSEPART- 1RAYThe vein descends vertically through the neck as a content ofCarotid streath which is a facidi) 4) Internal Internal jugular carotid vein artery. 2.) Vagus Nerve 3) Common Carotid Arterytubular sheath containing -BULB)SUPERIOR BULBINFERIOR BULBIt is a dilation near its origin.It is a smaller dilation nearIt's situated in the jugular fossa.its unitation with thein the inferior surface of temporalSub-clavian vein. It lies betweenbone, forming the posterior part ofSternal and Clavicular head ofthe floor of tymparic cavity. TheSternodedomastiod.walls of the bulb adhere to the fossa.VALVESJust above the inferior bulb of internal jugular vein contains apair of valves. INTERNAL JUGULAR VEIN (TRIBUTARIES)Immediately inferior to Jugular ForamenPART-3Inferior petrosal Sinus : 1st tributary of internal jugular vein.through anterior part of jugular foramen.comunicate the cavernous sinus with superior bulb after passingSometime a vein from cochlea may from the 1st tributary.In the Neck which Pharyngeal is situated Veins: Begins in the in outer the surface pharyngeal of superior venous plexusconstrictor muscle of pharynx.DIDAHKARRAYCommon Facial Vein: Formed by union of anterior facial Vein and anteriordivision of retromandibular vein. a little below andinfront of the angle of mandible and drains into the internal jugular V.Superior Thyroid Vein: Begins in the substance and on the Surface ofand cricothyroid veins and ends in the Internal jugular vein or in facial vein-thyroid gland and receives the superior langialLingual Vein: Both superficial vein accompanying the hypoglossal nerveand Deep lingual Vein accompanying the lingual arterydrain into internal jugular vein either separately or as a common trunk.Occipital Vein: Sometimes INTERNAL JUGULAR VEIN (TRIBUTARIES)continuationIN Root of NeckDIPANKAR RAYMiddle Thyroid Vein : Collects blood from lower part of the thyroidgland and receives some veins from larynxand trachea. It ends in the lower part of internal jugular Veinunder cover of the superior belly of omohyoid.Thoracic duct & Right lymphatic Duct.PART-4Thoracie duct on the left side or right lymphatic duct on the contrarelatedside: Each duct opens at the junction of the corresponding subclarianand internal jugular vein.-The 1st and last tibutaries are peculiar, because the 1st is avenous sinus and the latter is a lymphatic dact.INTERNAL JUGULAR VEINT (COMMUNICATION)Awith external jugular vein in the upper part of neck bymeans of Oblique Jugular VeinBWith caverrous sinus via inferior petrosal sinus anda plexus of veins around internal carotid artery. WITHIN THE CAROTID SHEATHUpto level of upper border ofBelow the level of upper borderthyroid cartilageof thyroid cartilage(i) Internal jugular vein (lies laterally)Internal jugular vein (lies(ii) Internal carotid A. (lies medially) (ii) Common Carotid A (lies medially laterally)(iii) Vagus N Clies in between and (iii) Vagus Nerve (lies in between andposterior to (i) &(ii)posterior to (i) & ii )RAYINTERNAL JUGULAR VEIN (RELATION)PART-OUTSIDE THE CAROTID SHEATHANTERIOR RELATIONPOSTERIOR RELATION1. Above the level of digastric muscle(Posterior belly)Posteriorly internal jugular(i) Parotid gland (ii) of Styloid process i styloid groupvem rest from abovedownwards -(iii) Spinal accessory N. (iv) Posterior articular A.muscles.1) Rectus capitis lateralis.(v) Occipital Artery.2) Transverse process of atlaswith e, nerve2. Between posterior belly of digastric andSuperior belly of omohyoid3) Levator scapulae4) Scalenus medius(i) Posterior belly of digastric muscle5) Cervical plexus of nerves(ii) Stemo mastoid arteries (iv) Descendens claricle6) Scalenus anterior(v) Superior belly of homohyoid.7) Phrenic Nerre3- Bellow superior belly of omohyoid8) Thyrocervisal Trunk(A) Superior hyoid group of muscles9) 1st Part of vertebral AriangStermo hyoid (ii) Sternothyroid (iii)Thyrohyoid10) 1st Part of Subclavian Artery(b) Anterior jugular vein11) Thoracic duct (left Side)All these are overlapped by Sternocl edomastoid12) Rt. Lymphatic duct (Rt Side)muscle