Extensor mechanism of finger

Extensor mechanism of finger, very easy notes. Referred from cynthia norkin. In this ppt in last two slides u can see the identify the parts. Its like a quiz for candidates who studying this ppt. They can able to know that how well they prepared this topic.
Thank you, From Liki pedia
(A student physiotherapist)

1. EXTENSOR MECHANISM of finger LIKI PEDIA

2. Structures involved Extensor digitorum communis Extensor indicis proprius Extensor digiti minimi

3. These muscles passes from the forearm to hand beneath extensor retinaculum . The tendons of EDC, EIP & EDM variability on the dorsum of hand. EDC tendon leads to the extensor hood. 1EIP tendon insert into the hood of EDC. EDC tendon of one finger may also be connected to adjacent finger by juncturae tendinae .

4. JUNCTURAE TENDINAE

5. EDC tendon of each finger is split into 3 bands 1. Central tendon 2. Lateral band 3. Terminal band

6. 1. Central band Inserts at the base of middle phalanx.

7. 2. Lateral band and 3. Terminal band Both the lateral band rejoins to form the terminal band at the distal phalanx.

8. EDC have two components Active components Passive components

9. Active components Dorsal interossei Volar interossei Lumbricals

10. Proximal – dorsal and volar interossei arises from the sides of metacarpal joints Distal – join at the extensor hood which also wraps the EDC and also contributes the central tendon and lateral band fibers. Lumbricals and interossei both together refer to as intrinsic muscles.

11. Passive components Sagittal band Oblique retinacular ligament Triangular ligament

12. Sagittal band It helps in stabilization of lateral bands on the dorsum of hand. It connects the dorsal surface of extensor hood to the volar plate and the deep transverse metacarpal ligament. Sagittal band is not only for volar plates but also it stabilizes the hood of MCP joint. It prevents the bowstring of extensor mechanism.

13. Oblique retinacular ligament Proximal – both the side of proximal phalanx and annular and cruciate pulleys. Distal – distal to the distal phalangeal joint.

14. Triangular ligament Triangular ligament & sagittal bands are interconnected by the lateral band

15. Identify the parts