Third metacarpal styloid process

Anatomical feature of the human hand

General Information
Latin	processus styloideus ossis metacarpi tertii
Greek
TA98
TA2
FMA
Details
System	Skeletal
Artery
Vein
Nerve
Lymphatic drainage
Precursor	Mesoderm
Function
Identifiers
Clinical significance
Notes

The third metacarpal styloid process is a bony prominence located at the base of the third metacarpal bone in the human hand. It serves as an important anatomical landmark and plays a crucial role in the attachment of ligaments and tendons that contribute to the stability and function of the hand.

Anatomy

The third metacarpal styloid process is situated on the dorsal aspect of the base of the third metacarpal bone. It is a small, pointed projection that extends proximally towards the wrist. This process is unique to the third metacarpal and is not present on the other metacarpals.

Relations

The third metacarpal styloid process is closely associated with the capitate bone, which is the largest of the carpal bones and articulates with the base of the third metacarpal. The process provides an attachment point for the extensor carpi radialis brevis tendon, which is involved in the extension and abduction of the wrist.

Function

The primary function of the third metacarpal styloid process is to serve as an attachment site for ligaments and tendons. This includes the attachment of the extensor carpi radialis brevis tendon, which plays a role in wrist movement. The presence of the styloid process enhances the mechanical leverage of these tendons, contributing to the dexterity and strength of the hand.

Clinical significance

Injuries to the third metacarpal styloid process are relatively rare but can occur due to trauma or overuse. Fractures of the styloid process may result from direct impact or excessive force applied to the hand. Such injuries can lead to pain, swelling, and impaired hand function. Treatment typically involves immobilization, and in some cases, surgical intervention may be necessary to restore proper alignment and function.

Also see

• Metacarpal bones
• Carpal bones
• Extensor carpi radialis brevis
• Hand anatomy