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Hand Muscle Anatomy

By Edited Aug 30, 2016 0 0

Hand Muscle Anatomy
The hand muscle anatomy is relatively small compared to other muscles in the body. Nevertheless, their function is very important to human being for it enables them to perform specific tasks necessary for the activities of daily living. The functions of the hand muscle’s anatomy allow the person to pick and use objects, grasp, hold, and so much more. From simple to complex tasks, the anatomy of hand muscle can do it all.

Hand Muscle Anatomy Parts

Dorsal View:

  • Extensor digitorum - Hand Muscle Anatomy
    Extensor digitorum
  • Extensor digiti minimi - Hand Muscle Anatomy
    Extensor digiti minimi
  • Extensor carpi ulnaris - Hand Muscle Anatomy
    Extensor carpi ulnaris
  • Extensor retinaculum - Hand Muscle Anatomy
    Extensor retinaculum
  • First dorsal interosseous muscle - Hand Muscle Anatomy
    First dorsal interosseous muscle
  • Abductor digit minimi - Hand Muscle Anatomy
    Abductor digit minimi
  • Extensor digitorum tendons - Hand Muscle Anatomy
    Extensor digitorum tendons

Palmar View:

  • Abductor pollicis brevis - Hand Muscle Anatomy
    Abductor pollicis brevis
  • Abductor pollicis - Hand Muscle Anatomy
    Abductor pollicis
  • Lumbricals - Hand Muscle Anatomy
    Lumbricals
  • Flexor digit minimi - Hand Muscle Anatomy
    Flexor digit minimi
  • Abductor digiti minimi - Hand Muscle Anatomy
    Abductor digit minimi
  • Flexor retinaculum - Hand Muscle Anatomy
    Flexor retinaculum
  • Antebrachial fascia - Hand Muscle Anatomy
    Antebrachial fascia
  • Flexor pollicis longus - Hand Muscle Anatomy
    Flexor pollicis longus
  • Flexor digitorum superficialis - Hand Muscle Anatomy
    Flexor digitorum superficialis
  • Flexor carpi ulnaris - Hand Muscle Anatomy
    Flexor carpi ulnaris

These small parts of the hand muscle anatomy work together to achieve both fine and gross motor skills.

Overview of the Hand Muscle Anatomy

The hand muscle anatomy contains short muscles, tendons, and some long muscles. The hand muscle is divided into three sets; middle set, external set, and the internal set. These sets comprise the extrinsic extensors, extrinsic flexors, and the intrinsic. Extrinsic extensor muscles consist of three wrist extensors as well as the thumb and digit extensors. The extrinsic flexors include 3 wrist flexors, the thumb flexor, and digit flexors. The intrinsic muscles are located within the hand with subparts thenar, hypothenar, lumbrical, and interossei muscles. Each of these subparts has their own different hand muscle.

Extrinsic Extensors Hand Muscle Anatomy

Extrinsic Extensors Hand Muscle Anatomy
If there are flexors, there are also extensors of the hand muscle anatomy. There two long flexors situated at the lateral side of the forearm. These flexors are inserted at the phalanges of the fingers by tendons. The flexors allow the bending of the phalanges. Among the fingers, the thumb is the only one that has two flexors which differ in length. These thumb muscles allow a person to grasp and hold objects.

Extrinsic Flexors Hand Muscle Anatomy

Extrinsic Flexors Hand Muscle Anatomy
The main flexor of the wrist is the flexor carpi radialis. It inserts the third metacarpal, fifth metacarpal, and the palmar fascia. The primary ulnar deviator is the flexor carpi ulnaris. These muscles pass through the carpal tunnel and from there, it flexes the interphalangeal joints.

Intrinsic Muscle of the Hand Anatomy

Intrinsic Muscle of the Hand Anatomy
Intrinsic muscles in the hand muscle anatomy are located within the hand that is why they are called intrinsic. The thenar, hypothenar, lumbrical, and interossei muscle groups comprise the intrinsic muscles. The thenar group involves the abductor pollicis brevis, flexor pollicis brevis, opponens pollicis, and adductor pollicis. The hypothenar group includes the palmaris brevis, abductor digiti minimi, flexor digiti minimi, and opponens digiti minimi. The lumbrical muscles allow the metacarpophalangeal joints to flex and extend the interphalangeal joints. The interossei muscle group is responsible for the abduction of fingers.

Summary of the muscle of the Hand Anatomy

The hand muscle anatomy comprises only a small part of the muscular system of the body. But these muscles are complex in nature and its functions are very important for a human being to perform daily activities. As we can see, divisions of the hand muscles were formulated for easy identification.

Truly the anatomy of the hand muscle requires deeper understanding to fully grasp the individual functions of a muscle. More readings and lessons are needed to fully comprehend these complex hand muscle anatomy parts.

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