Intercostal Nerves Notes

INTERCOSTAL HERVESThe 12 pairs of thoracic Spinal nerres supply the thoracicthey wall. divide As soon into as amerior they leave, and the posterior interventebral rami foraminaINTERCOSTAL NERVE: 1 The anterior primary rami of upper11 theracic spinal nerves (T,-T1) arecalled Intercostal Nerves.DIPANKAR RAYSUBEOSTAL NERVE:- The anterior primary ramus of the 12ththoracic spinal nerve runs in the abdominalwall below the 12th rib, hence it is called Subcostal nerve.LIMIUUU FEATURES :- rami The intercostal of nerves are anterior primaryfrom Segmental in character unlike the anterior arethoracic spinal nerves. Theyfrom viz. other regions of spinal and which form primary nerve rami plexusesCervical . Brachial, number and Sarral.CLASSIFICATIONHuman AnatomyFor Exam.The - intercustal nerves are classified into the following 2 groups(1) TYPICAL INTERCUSTAL NERVESTypical intercostal nerves are those which remain confined totheir own intercostal spaces.Nerves are - 3rd, 4th, 5th and 6th(2) ATYPICAL INTERCOSTAL NERVESAtypical intercostal nerves extend becond the thanacic walland partly or Nerves entirely supply the other regions.are - 1st, 2nd, 7th, 8th, 9th, 10th and 11th INTERCOSTAL NERVES2TYPICAL IMERCOSTAL NERVECOURSE & RELATION :-Human AnatomyFor Exam1It comes out of the intervertebral foramen.2Each nerve passes below the neck of the rib of the samenumber and enters the costal groove.3In Costal Groove :-The neme lies below the posteriorintercostal vessels.DPANKAR RAY@above The relationship downwards of is structures in the costal groove frominterrostal artery and posterior intercostal internostal nerve vein, posteriorbthe Posterior pleura, part with of the the costal groove the (VAN) nerve lies betweeninternal intercostal membrane endotheracic fasia and theCeIn intercostalis greater part of space, the name lies betweenintimi and the internal intercostal musde: the4thorasic Near the steruum, the nerve Crosses in front of the internalvessels and the sternocostalis muscle.5It external then pierces the internal intercostal muscle, themuscle of the thorax. to intercostal terminate membrane as the anterior and the cuteneous pectoralis majornerve INTERCOSTAL NERVES3BRANCHES :-MUSCULAR BRANCHES(1)Muscielar Branches :- the Numerous muscular branches supplyintercostal muscles, the transversetheracis and the serratus posterior superior.(2) Collateral Branch:- of A the collateral branch arises hear the anglerib and runs in the lowerof muscles the spare of the in the same neurovaseular plane. It supplies partspace.SENSORY BRANCHESHuman Anatory For Exam.(3) The main branch and the collateral branch- also supplyparietal in Neura, periosteum of the ribs The lower nervesaddition supply the parietal peritoneum.(4) and Lateral Cuteneous Branch:- - Arises near the ange of the ribwhere accompanies the main trunk up to the lateral thoracicthe it pieces the interiostal muscles and other wall ofafter body wall along midaxillary line. It is distributed muscles to skindividing into anterior and posterior branches(5) Anterior Sterum futeneous Branch:- Emerges on the side ofmedial to supply the branches. overlying Skin after dividing into theand lateralCOMMUNICATING BRANCHESDIPANKAR RAY6) Rami Communicates :- Each nerve communicates with thecorresponding thoracic ganglion by white and grey ramiCommunicants.7) Inter costo brachial Nerves f Lateral cuteneous branch of 2ndIt supplies the skin of the floor of the axilla and ofintercostal nerve)the upper part of the medical side of am.