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Muscles of the Forearm. Dr.Nivin Sharaf MD. Objectives. - Describe the function of the muscles in the anterior and posterior compartment of the forearm .

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muscles of the forearm

Muscles of the Forearm

Dr.NivinSharaf MD

objectives
Objectives
  • -Describe the function of the muscles in the anterior and posterior compartment of the forearm.
  • -Name and identify the muscles in the anterior (flexor/pronator) and posterior (extensor/supinator) compartments of the forearm, noting their relations.
  • -Name and identify the neurovascular structures in the anterior) and posterior compartments of the forearm, noting their relations.
names of the muscles of forearm
Names of the Muscles of forearm
  • Many of them
  • Long names: good guide to location and function
  • Location: ie. superficial / deep

radial / ulnar

(which side is the thumb on??)

  • Function: ie. flexor / extensor

adductor / abductor

  • Does it act on the thumb (pollux) or the fingers (digits)?
functional organization
Functional Organization
  • Anterior compartment – flexor / pronator
  • Posterior Compartment – extensor / supinator
  • Flex the wrist ………[flexor]
  • Extend the wrist ……..[extensor]
  • Pronate the forearm ……..[pronator]
  • Acting on wrist (carpus) only ……[carpi]
  • Acting on fingers ……..[digiti / digitorum]
  • Acting on thumb (pollux) ……[pollicus]
slide8

Movements of fingers.

MCP (condyloidjts): flexion / extension

abduction / adduction

IP (hinge jts): flexion / extension

X

X

slide9

Movements of the thumb – a specialized digit, occur at

right angles to the fingers. Mainly at the CMC (saddle) jt.

MCP – condyloid; IP – hinge (like fingers).

slide11

Anterior forearm:

Flexor / pronator Compartment.

Protonator teres

  • Superficial:
  • common flexor origin
  • pronator teres
  • flexor carpi radialis
  • palmarislongus
  • flexor digitorum
  • superficialis,
  • flexor carpi ulnaris

Brachioradialis

flexor carpi radialis

palmaris longus

flexor digitorum superficialis

flexor carpi ulnaris

slide12

Functional organization:

  • Only flex at the wrist.
  • Flexor carpi radialis
  • Palmaris longus
  • Flexor carpi ulnaris

Flexor Carpi Radialis

Palmaris Longus

Flexor Carpi ulnaris

anterior fore arm
Anterior Fore Arm

Pass

Fail

Pass

Fail

ant fore arm
Ant Fore arm

Wrist Flexors

FCU+FCR

FDS

FDP

PL

Wrist Add

FCU

Wrist Abd

FCR

Nerve Supply

post forearm superficial disection
Post. ForearmSuperficial disection

Nerve Supply

Radial Nerve

Anatomical snuff box

post forearm
Post. Forearm

A:

Extensor Digitorum

B:

Extensor Carpi Ulnaris

C:

BrachioRadialis

D:

Biceps Brachii

E:

Triceps

F:

Extensor Retinaculum

muscles of the forearm post view
Muscles of the Forearm Post View

Origin :Lateral epicondyle of humerusInsertion Lateral surface of olecranon andsuperior part of posterior surface of ulna Action Assists triceps in extending forearm;stabilizes elbow joint; abducts ulna during pronationInnervation Radial nerve (C7, C8 and T1)

Anconeus

Radial nerve innervates the BEST.

BrachioradialisExtensorsSupinatorTriceps

slide19

Deep posterior compartment.

  • - abductor pollicis longus
  • - extensor pollicis brevis
  • - extensor pollicis longus
  • - extensor indicis
  • - supinator
  • Functional organization:
  • extend hand at wrist
  • extend / abduct thumb
  • extend index finger
  • supinate

abductor pollucis longus

extensor pollicis brevis

extensor pollicis longus

extensor indicis

slide21
Quiz

12. Pronator Teres

13. Flexor carpiradialis:

14. Flexor Digitorum:

15. Extensor carpiulnaris:

16. Extensor digitorum:

17. Extensor carpiradialis:

rotators of the radius
Rotators of the Radius

Pronators

Supinator

Biceps Brachii

slide23

Pronation / Supination:

Occurs at radio-ulnar jts.

Proximal:

Head of radius

articulates with radial notch of ulna (pivot jt). It is held in place by the annular ligament.

Distal – Radius pivots around the fixed distal end of ulna (pivot jt).

Radio-ulnar articulation is stabilized by interosseus membrane.

slide24
Common Extensor Origin
  • Common

Extensor

Origin

slide25

Course of radial and ulnar arteries in forearm

Axillary vein:

continuation of basilic vein

slide26

Neurovasculature (deep).

  • Lateral:
  • radial artery
  • radial nerve
  • Midline:
  • median nerve
  • anterior interosseus a.
  • anterior interosseus n.
  • (deep branch of median)
  • Medial:
  • ulnar artery
  • (gives off common interosseus artery divides into anterior and posterior branches)
  • ulner nerve

radial n

ulnar a

radial a.

ulnar n

median n

anterior interosseus a + n

slide27

Radial Nerve

Neurovasculature.

Radial nerve and its branches supply

all muscles in posterior compartment, including brachioradialis (!).

- superficial radial nerve

- deep radial nerve

- posterior interosseus nerve.

Posterior interosseus artery runs between superficial and deep muscles

Brachioradialis

Deep branch

posterior interosseus branch

Superficial branch

slide28

Neurovasculature.

Lateral: radial artery

radial nerve

Midline: median nerve

[supplies all muscles except

flexor carpi ulnaris and

medial half of flexor

digitorum profundous]

Medial: ulnar artery

ulnar nerve

radial n.

Brachioradialis

radial a

ulnar n.

ulnar a.

median n.

ulnar nerve
Ulnar Nerve
  • Medial ½ of FDP
  • FCU
  • All hand muscles except 11/2 muscle groups(lateral 2 lumbricals and thenar muscles )
references
References
  • Grey’s Anatomy
  • Netter
  • Keith Moore
  • www.maestro.uottawa.ca
  • Recommended reading:
  • Clinically Oriented Anatomy,6th edition Keith Moore
  • Pages:744-771