The extensor hood spreads out further distally into a median band which attaches to the middle phalanx
Where does Central slip attach?
Anatomy. As the extensor mechanism of the hand crosses over the PIP joint, it branches into 3 bands: the central slip and 2 lateral bands (Figure 2). The central slip attaches to the middle phalanx and the lateral bands attach to the distal phalanx.
Is the central slip an extensor tendon?
This deformity is characterised by flexion of the proximal interphalangeal joint (PIP) and hyperextension of the distal interphalangeal joint (DIP) due to the volar subluxation of the lateral bands. It is an extensor tendon injury over zone III. It is also referred to as a “buttonhole deformity.”
How many extensor tendons are in the hand and where do they attach?
| Abbreviation | ECU | Full Name | Extensor carpi ulnaris | Insertion | Base of metacarpal V | Function | Extends and abducts hand |
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Which tendons are attached to dorsal digital expansion?
Palmar/dorsal interossei and lumbricals tendons reinforce the lateral slips. This whole arrangement is called dorsal digital expansion. The extensor expansion extends from the distal metacarpal head to the proximal phalanx and serves to hold the extensor tendons in place.
What is the function of central slip?
The extensor tendon is divided into three parts, one central slip and two lateral bands. Central slip and lateral bands attach to different bones in the finger and act to straighten the finger . If central slip rupture occurs, the finger cannot be straightened normally and thus a boutonniere deformity manifests.
Can a tendon slip?
Many tendons in the body are held in place by supportive connective tissue, such as a ligament or retinaculum. If the supportive tissue has been damaged or injured, the tendon may be free to slip out of its normal position . This is called subluxation.
What is Central slip injury?
What is a central slip injury? The injury you have sustained is known as a central slip injury which is sometimes called a boutonniere deformity. This means that part of the tendon which straightens the middle joint of your finger has been injured .
What role does the central slip extensor tendon play in the function of the hand?
The central tendon (or “slip”) proceeds dorsally to attach to the base of the middle phalanx, where tension can extend the proximal interphalangeal (PIP) joint . ... PIP extension (produced by other tissues in the extensor mechanism) elongates the ORL, creating passive tension that extends the DIP.
Can tendons heal without surgery?
In some cases, the affected tendon can’t heal properly without surgical intervention . This problem commonly occurs with major tendon tears. If left unattended, the tendon will not heal on its own and you will have lasting repercussions.
Can finger tendons heal without surgery?
A cut tendon cannot heal without surgery . Nearby nerves and blood vessels may need to be repaired as well. After surgery, the injured area will need to be moved to limit stiffness, but the repair must be protected. Tears caused by jamming injuries are usually treated with splints.
How long do extensor tendons take to heal?
The tendon may take eight to twelve weeks to heal completely. Longer periods of splinting are sometimes needed. Your doctor will apply the splint in the correct place and give you directions on how long to wear it.
Does thumb have extensor expansion?
On the extensor surface of the thumb, there is no extensor expansion proper : the tendons of the extensor pollicis brevis and longus muscles are inserted separately in the proximal and distal phalanx respectively.
What is the advantage of the extensor hood mechanism?
The extensor expansion allows for contractile forces from the extensor compartment muscles to be transferred to the phalanges . It also balances the forces across the phalanges.
Which muscles attach onto the extensor expansion?
- supinator muscle. supinator arch.
- abductor pollicis longus muscle.
- extensor pollicis brevis muscle.
- extensor pollicis longus muscle.
- extensor indicis muscle.
