Palmar interossei muscles

Palmar interossei muscles

Muscle infobox
Name = Palmar interossei muscles
Latin = musculi interossei palmares
GraySubject = 126
GrayPage = 465


Caption = The Interossei volares of left hand.
Origin = metacarpals
Insertion = proximal phalange
Action = adduction
Antagonist = Dorsal interossei of the hand
Blood =
Nerve = deep branch of ulnar nerve
MeshName =
MeshNumber =
DorlandsPre = m_22
DorlandsSuf = 12549407
The palmar interossei (interossei volares) are small muscles in the hand that lie on the anterior aspect of the metacarpals. They are smaller than the dorsal interossei of the hand, which lie "between" the metacarpals.

tructure

Each palmar interosseous muscle arises from the entire length of the metacarpal bone of one finger, and is inserted into the side of the base of the proximal phalanx and extensor expansion of the extensor digitorum tendon to the same finger.

There are three palmar interossei:

The palmar interossei are unipennate.

From this account it may be seen that each finger is provided with two interossei, with the exception of the little finger, in which the abductor digiti minimi muscle takes the place of one of the pair.

Some texts consider the medial head of the flexor pollicis brevis to be a palmar interosseous muscle. This muscle would then be considered the first palmar interosseous muscle, and the total number of palmar interosseous muscles in the hand would be four.

Innervation

All of the interosseous muscles of the hand are innervated by the deep branch of the ulnar nerve.

Actions

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. The interossei also assist the lumbricals.

Pollical Palmar Interosseous Muscle (of Henle, PPIM)

It is currently accepted that more than 80% of individuals present a pollical palmar interosseous muscle (of the thumb) as suggested by Henle's description in 1858 and verified by numerous investigations such as those carried out by Randall S. Susman, Lukhanyo Nyati, and Mandeep S. Jassal. [Susman RS, Nyati L, Jassal MS. Observations on the pollical palmar interosseous muscle (of Henle). Anat Rec. 1999 Feb 1;254(2):159-65. PMID 9972800 ]

ee also

* Plantar interossei muscles
* Dorsal interossei of the foot
* Dorsal interossei of the hand

References

External links

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* [http://www.ptcentral.com/muscles/musclearms.html#palmar%20interossei PTCentral]


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