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Just above the level of the wrist, the dorsal cutaneous branch of the ulnar artery arises from between the extensor and flexor carpi ulnaris muscles. Innervation. Extensor carpi ulnaris is innervated by the posterior interosseous nerve (C7, C8), a branch of the deep division of the radial nerve. The radial nerve stems from the posterior cord of ...
Origin. The extensor carpi ulnaris muscle originates from the lateral epicondyle of the distal humerus and the posterior aspect of the ulna [1]. Insertion. It inserts onto the dorsal base of the fifth metacarpal after passing through the sixth compartment of the extensor retinaculum [1]. Nerve.
The radial nerve dives posteriorly through the heads of the supinator muscle in the antecubital fossa to form the posterior interosseous nerve. It innervates the extensor carpi ulnaris muscle in addition to the other muscles in the posterior compartment of the forearm.
Despite its name, the extensor carpi ulnaris is innervated by the posterior interosseous nerve (C7 and C8), the continuation of the deep branch of the radial nerve. [1] It would therefore be paralyzed in an injury to the posterior cord of the brachial plexus .
Origin: Lateral epicondyle of humerus, via common extensor tendon, and posterior border of ulna. Insertion: Medial aspect of base of fifth metacarpal bone. Action: Extends and adducts hand at radiocarpal (wrist) joint. Innervation: Posterior antebrachial interosseous nerve (C7-C8).
The tendon of the extensor carpi ulnaris passes through the 6th extensor compartment at the wrist. Attachments: Originates from the lateral epicondyle of the humerus and attaches to the base of the 5th metacarpal . Actions: Extension and adduction of wrist. Innervation: Radial nerve (deep branch). Blood supply: Ulnar artery
What is the extensor carpi ulnaris (ECU) muscle, where is it located. Learn its anatomy, tendon attachments, nerve, blood supply, & functions.
Extensor Carpi Ulnaris. Origin. Lateral epicondyle of humerus and posterior border of ulna. Insertion. Base of 5th metacarpal. Action. Wrist extension and wrist adduction. Innervation. Posterior interosseous nerve (C7, C8)
Interactive 3D model and details on the anatomy of the extensor carpi ulnaris muscle covering its origin, insertion, action, innervation and blood supply.
The extensor carpi ulnaris muscle is a slender muscle located in the posterior compartment of the forearm. To comprehensively understand its anatomy and function, let's delve into its origin, insertion, muscle path, and function. Origin and Insertion: