Dorsal Interossei of the Hand: Difference between revisions
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== Description == | == Description == | ||
In the hand there are four dorsal Interossei which lie superficially, inbetween the metacarpals on the dorsum of the hand. Each muscle is bipennate in shape and extends from the proximal ends of adjacent metacarpals to the proximal phalanx and dorsal digital expansion of the appropriate finger. The position of the insertion site is dependent on which digit is involved. On the first and second digit the muscle lies on the lateral side and in the third and fourth digit it lies of the medial side. <br> | In the hand there are four dorsal Interossei which lie superficially, inbetween the metacarpals on the dorsum of the hand. Each muscle is bipennate in shape and extends from the proximal ends of adjacent metacarpals to the proximal phalanx and dorsal digital expansion of the appropriate finger. The position of the insertion site is dependent on which digit is involved. On the first and second digit the muscle lies on the lateral side and in the third and fourth digit it lies of the medial side. <br> | ||
== Anatomy == | == Anatomy == | ||
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=== Origins and Insertions === | === Origins and Insertions === | ||
{| width="531 | {| width="531" cellspacing="1" cellpadding="1" border="1" align="center" | ||
|- | |- | ||
| | | Muscle<br> | ||
| Origin<br> | | Origin<br> | ||
| Insertion <br> | | Insertion <br> | ||
|- | |- | ||
| 1st | | 1st <br> | ||
| | | | ||
Medial side of the proximal end of the first metacarpal and lateral side of the second metacarpal <br> | Medial side of the proximal end of the first metacarpal and lateral side of the second metacarpal <br> | ||
| Lateral side of the base of the second proximal phalanx and the extensor expansion (Extensor Hood)<br> | | Lateral side of the base of the second proximal phalanx and the extensor expansion (Extensor Hood)<br> | ||
|- | |- | ||
| 2nd | | 2nd <br> | ||
| Medial side of the second metacarpal and lateral side of the third metacarpal<br> | | Medial side of the second metacarpal and lateral side of the third metacarpal<br> | ||
| Lateral side of the base of the third proximal phalanx and the extensor expansion <br> | | Lateral side of the base of the third proximal phalanx and the extensor expansion <br> | ||
|- | |- | ||
| 3rd | | 3rd <br> | ||
| <br> | | Medial side of the third metacarpal and lateral side of the fourth metacarpal<br> | ||
| <br> | | Medial side of the base of the third proximal phalanx and the extensor explansion <br> | ||
|- | |- | ||
| 4th | | 4th <br> | ||
| <br> | | Medial side of the fourth metacarpal and lateral side of the fifth metacarpal <br> | ||
| <br> | | Medial side of the base of the fourth proximal phalanx and the extensor explansion <br> | ||
|} | |} | ||
<br> | <br> | ||
=== Nerve Supply === | === Nerve Supply === | ||
The Dorsal Interossei muscles are all supplied by the deep branch of the ulnar nerve (C8, T1). <br> | The Dorsal Interossei muscles of the hand are all supplied by the deep branch of the ulnar nerve (C8, T1). <br> | ||
=== Blood Supply === | === Blood Supply === | ||
The Dorsal Interossei are supplied by the dorsal and palmar interossei artery <br> | The Dorsal Interossei muscles of the hand are supplied by the dorsal and palmar interossei artery <br> | ||
== Function == | == Function == | ||
=== Actions === | === Actions === | ||
The dorsal interossei muscles are muscles that abduct the second, third and fourth digits. The first digit and the fifth digit have their own abductor muscles in the thenar and hyperthenar eminence and so do not have interossei musculature. | |||
=== Functional contributions === | === Functional contributions === | ||
== | As the dorsal interossei muscles attatch to the extensor expansion (extensor hood) of the digits, it also assists in addition to the lumbricals in producing flexion and extension of the metacarpophalangeal and interphalangeal joints. | ||
== == | |||
== Techniques == | == Techniques == | ||
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=== Palpation === | === Palpation === | ||
The dorsal interossei muscles can be palpated in the dorum of the hand on resisted abduction of the fingers between the metacarpals. <br> | |||
=== Treatment === | === Treatment === | ||
Revision as of 19:08, 14 February 2016
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Description[edit | edit source]
In the hand there are four dorsal Interossei which lie superficially, inbetween the metacarpals on the dorsum of the hand. Each muscle is bipennate in shape and extends from the proximal ends of adjacent metacarpals to the proximal phalanx and dorsal digital expansion of the appropriate finger. The position of the insertion site is dependent on which digit is involved. On the first and second digit the muscle lies on the lateral side and in the third and fourth digit it lies of the medial side.
Anatomy[edit | edit source]
Origins and Insertions[edit | edit source]
| Muscle |
Origin |
Insertion |
| 1st |
Medial side of the proximal end of the first metacarpal and lateral side of the second metacarpal |
Lateral side of the base of the second proximal phalanx and the extensor expansion (Extensor Hood) |
| 2nd |
Medial side of the second metacarpal and lateral side of the third metacarpal |
Lateral side of the base of the third proximal phalanx and the extensor expansion |
| 3rd |
Medial side of the third metacarpal and lateral side of the fourth metacarpal |
Medial side of the base of the third proximal phalanx and the extensor explansion |
| 4th |
Medial side of the fourth metacarpal and lateral side of the fifth metacarpal |
Medial side of the base of the fourth proximal phalanx and the extensor explansion |
Nerve Supply[edit | edit source]
The Dorsal Interossei muscles of the hand are all supplied by the deep branch of the ulnar nerve (C8, T1).
Blood Supply[edit | edit source]
The Dorsal Interossei muscles of the hand are supplied by the dorsal and palmar interossei artery
Function[edit | edit source]
Actions[edit | edit source]
The dorsal interossei muscles are muscles that abduct the second, third and fourth digits. The first digit and the fifth digit have their own abductor muscles in the thenar and hyperthenar eminence and so do not have interossei musculature.
Functional contributions[edit | edit source]
As the dorsal interossei muscles attatch to the extensor expansion (extensor hood) of the digits, it also assists in addition to the lumbricals in producing flexion and extension of the metacarpophalangeal and interphalangeal joints.
[edit | edit source]
Techniques[edit | edit source]
Palpation[edit | edit source]
The dorsal interossei muscles can be palpated in the dorum of the hand on resisted abduction of the fingers between the metacarpals.
Treatment[edit | edit source]
Recent Related Research (from Pubmed)[edit | edit source]
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Resources[edit | edit source]
References[edit | edit source]
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