Insertion of lumbricals

1. Where do the lumbricals insert?
2. What is the origin and insertion of the lumbricals?
3. What is the origin of the lumbrical muscles?
4. What is the function of lumbricals?
5. Where do the interossei insert?
6. Where do the dorsal interossei insert?
7. Are the lumbricals intrinsic or extrinsic?
8. What are the four lumbricals?
9. What two nerves innervate the lumbricals?
10. What are the attachments of the Lumbricals Pedis?
11. Are lumbricals intrinsic muscles?
12. Which side does the dorsal interossei insert into on digit 3?
13. Are the lumbricals intrinsic or extrinsic?
14. What are the attachments of the Lumbricals Pedis?
15. What is the difference between dorsal and palmar interossei?
16. What is the origin and insertion of palmar interossei?
17. What is the action of the 1st dorsal interosseous?

Where do the lumbricals insert?

The lumbricals are four, small, worm-like muscles on each hand. These muscles are unusual in that they do not attach to bone. Instead, they attach proximally to the tendons of flexor digitorum profundus and distally to the extensor expansions.

What is the origin and insertion of the lumbricals?

It originates from the radial side of the second most radial tendon of the flexor digitorum profundus (which corresponds to the middle finger). It passes posteriorly along the radial side of the middle finger and inserts on the extensor expansion near the metacarpophalangeal joint.

What is the origin of the lumbrical muscles?

Origin and insertion

Each lumbrical muscle originates from one or two adjacent tendons of the flexor digitorum profundus muscle. Lumbricals 1-2 are usually unipennate, meaning their fibers arise obliquely from one tendon, while lumbricals 3-4 are bipennate, arising from two adjacent tendons.

What is the function of lumbricals?

The lumbricals assist in metacarpophalangeal joint flexion; they contribute to interphalangeal joint extension by acting as deflexors of the proximal interphalangeal joint.

Where do the interossei insert?

The third and fourth palmar interossei originate at the lateral aspect of the fourth and fifth metacarpals and insert into the lateral aspect of their respective extensor hood. They additionally insert into the base of their respective proximal phalanx.

Where do the dorsal interossei insert?

Structure and Function

The first dorsal interosseous muscle has its origin on the adjacent surfaces of the first and second metacarpal bones and inserts into the lateral base of the second phalanx and extensor hood of the second digit.

Are the lumbricals intrinsic or extrinsic?

Four muscle groups comprise the intrinsic hand. These are the thenar, hypothenar, interossei and the lumbrical muscles.

What are the four lumbricals?

Gross anatomy

The first and second lumbricals arise from the radial side of the FDP tendons of the index and middle fingers. The third lumbrical arises from the adjacent tendons of the middle and ring finger while the fourth arises from the adjacent tendons of the ring and little finger.

What two nerves innervate the lumbricals?

Abstract. It has long been recognized that the first and second lumbricals are normally innervated by the median nerve, whereas the third and fourth lumbricals are innervated by the ulnar nerve (Sunderland and Ray, 1946).

What are the attachments of the Lumbricals Pedis?

The lumbricals pedis attach into the tendons of extensor digitorum longus merging into the dorsal digital expansion of toes #2-5. Each lumbrical pedis attaches into the medial side of its respective toe.

Are lumbricals intrinsic muscles?

The lumbrical muscles of the hand are intrinsic muscles of the hand associated with the flexor digitorum profundus (FDP) tendon.

Which side does the dorsal interossei insert into on digit 3?

Unlike the 1st and 2nd, the tendon of the 3rd dorsal interosseous inserts on the ulnar side of the base of the 3nd proximal phalanx and its dorsal digital expansion.

Are the lumbricals intrinsic or extrinsic?

Four muscle groups comprise the intrinsic hand. These are the thenar, hypothenar, interossei and the lumbrical muscles.

What are the attachments of the Lumbricals Pedis?

The lumbricals pedis attach into the tendons of extensor digitorum longus merging into the dorsal digital expansion of toes #2-5. Each lumbrical pedis attaches into the medial side of its respective toe.

What is the difference between dorsal and palmar interossei?

The palmar interosseous muscles adduct the fingers towards the middle finger. This is in contrast to the dorsal interossei, which abduct the fingers away from the middle finger.

What is the origin and insertion of palmar interossei?

The first palmar interossei also known as pollical palmar interosseous and it originates at the media palmar surface of the first metacarpal. It is often considered as rudimentary. The second palmar interosseous originates at the medial surface of the base of the second metacarpal.

What is the action of the 1st dorsal interosseous?

Function. The dorsal interossei abduct the index, middle, and ring fingers. The first dorsal interosseous is also able to rotate the index finger slightly at the metacarpophalangeal joint and assist adductor pollicis in thumb adduction.