![]() ![]() The thenar muscles are four in total they are evident and easy to palpate on the radial side of the palmar surface of the hand, at the base of the thumb. It also facilitates the passage of tendons and various neurovascular structures from the forearm to the hand. ![]() It is capable of various movements like flexion, extension, abduction and adduction. Palmar venous arches: Receives palmar metacarpal and digital veins. Gives rise to cephalic and basilic veins. They include: palmar arches (superficial, deep), palmar digital arteries (common, proper), dorsal carpal arch, dorsal metacarpal arteries, dorsal digital arteries, principal artery of the thumb.ĭorsal venous network of hand: predominant drainage route of the hand (also receiving palmar venous return via perforating veins). Mnemonic: Ulnar nerve supplies all intrinsic muscles of the hand except the LOAF muscles ( Lateral two lumbricals, Opponens pollicis, Abductor pollicis brevis, Flexor pollicis brevis)Īll the branches originate from the radial and ulnar arteries. Ulnar nerve and its branches (superficial, deep and dorsal) innervate the hypothenar and metacarpal groups Radial nerve provides cutaneous innervation along the outisde of the thumb. Median nerve and its branches (common and proper palmar digital nerves) predominantly supply the thenar muscles. Metacarpal group: lumbircals, palmar interossei, dorsal interossei Hypothenar group: abductor digiti minimi, flexor digiti minimi, opponens digiti minimi, palmaris brevis Thenar group: abductor pollicis brevis, adductor pollicis, flexor pollicis brevis, opponens pollicis Phalanges: proximal, middle, distal phalanges Key facts about the anatomy of the hand BonesĬarpals: scaphoid, lunate, triquetrum, pisiform, trapezium, trapezoid, capitate, hamate The other major contributors are actually the forearm muscles, which project tendons towards the hand via an equally complex and flexible anatomical structure, called the wrist.Ī solid understanding of the hand requires good grasp (pun intended) of its entire anatomy, so in this page we will look at all of the above structures. However, the intrinsic muscles of the hand are only partially responsible for all its range of motion. The hand itself consists of specific bones onto which various muscles are attached, and a collection of neurovascular structures responsible for drainage and innervation. It is strong enough to allow climbers to tackle any mountain, but also sufficiently precise for the manipulation of some of the world’s smallest objects and the performance of complex actions. The human hand, the most distal part of the upper limb, is a remarkable feat of engineering and evolution. ![]()
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