1. Muscles of the Arm

2. Muscles of Arm, Forearm & Hand
Muscles of Arm & Forearm dissection
Anatomy Models Dr. Bobrd on Youtube

3. O: supraglenoid tubercle I: radial tuberosity
Muscles of the elbow
Biceps brachii
Short head
O: coracoid process
Long head:
O: supraglenoid tubercle
I: radial tuberosity
What 2 joints does it
cross?
flex or extend the arm & forearm?
Also supinates forearm

4. Muscles of the elbow
Brachialis (Deep to biceps brachii) O: lower ½ of shaft of humerus I: coronoid process of ulna A:

5. Muscles of the arm
Triceps brachii Long head O: infraglenoid tubercle Medial Head O: humerus shaft Lateral Head O: posterior humerus I: olecranon process of ulna Flex/ Extend ?? arm & forearm Will triceps help pronate arm?

7. Muscles of the elbow Brachioradialis O: lateral epicondyle of humerus
I: styloid process of radius
(on models, you can see this one from both sides)
A: flexes arm in mid-prone position

8. Muscles of the forearm: Anterior, Superficial
All O: medial epicondyle
Pronator teres (1)
I: radius
Pronates hand & arm, flexes forearm
Flexor carpi radialis (2)
I: metacarpal
Flex & abduct hand
Palmaris longus (3)
(absent in approx. 14% of people!)
I: palmar aponeurosis
Flex hand
Flexor carpi ulnaris (4)
Flex & adduct hand
Muscles of the forearm: Anterior, Superficial 4 3 2 1

9. Muscles of the forearm: Anterior Intermeidate
Can you see your forearm tendons?
Flexor digitorum superficialis
O: medial epicondyle
I: middle phalanx 2-5
Flexes middle phalanx of fingers 2-5

10. Muscles of the forearm: Anterior Deep
Flexor digitorum Profundus I: distal phalynx 2-5 Flexes distal phalynx of fingers 2-5 Flexor pollicis longus I: distal phalynx Flex thumb Pronator quadratus Pronates hand & forearm

11. Flexor digitorum profundus
Tendons go all the way
to distal phalanges
Tendons stop at
middle phalanges
Flexor digitorum profundus
Flexor digitorum superficialis

12. Pronates hand & forearm
Pronator quadratus
(deep muscle)
O: ulna
I: radius
Pronates hand & forearm

13. Muscles of the forearm: Posterior Superficial Extensors & Supinators
All O: lateral epicondyle of humerus
Extensor carpi radialis longus (2)
I: metacarpals
Externsor carpi radialis brevis (3)
Both extend & abduct hand
Extensor digitorum
I: phalanges 2-5
Extend middle & distal phalanges
2-5 4
(4) 3 2 1
Muscle #1 is brachioradialis

14. Muscles of the forearm: Posterior
Superficial Extensor digiti minimi (5) Extends little finger Extensor carpi ulnaris (6) Extends & adduct hand Anconeus (7) Extends forearm 5 6 4
Flexor carpi ulnaris 7

15. Bony landmarks : lateral epicondyle (LE), olecranon process (OP), and the ulna itself, whose crest and head show at the distal and of the arm. The extensor muscles will follow: Anconeus (Anc), extensor carpi  ulnaris (ECU), extensor digitorum (ED),  extensor carpi radialis brevis (ECRB), exten. carpi radialis longus (ECRL), and brachiradialis (Brr). Some thumb muscles can also be seen: Abductor pollucis longus (APL), extensor pollucis brevis (EPB) and the tendon of extensor pollucis longus (EPL.) Finally, a few upper arm muscles are shown: Biceps brachii (BB), brachialis (Br), the lateral head of the triceps (Tlat) and the triceps tendon (TT).

17. Muscles of the forearm: Posterior
Deep Supinator (1) O: lateral epicondyle I:radius Supinates hand Abductor pollicis longus (2) Abduct thumb Extensor pollicis brevis (3) Extensor pollicis longus (4) Both extend thumb Extensor indicis (5) Extends index finger (point) 5 3 4
Anatomical
snuff box 2 1
Anconeus

18. Posterior forearm: deep
Supinator
O: humerus, ulna
I: radius
Abductor pollicis
longus
Extensor pollicis
longus & brevis
Extensor
indicis

19. Retinaculum The flexor retinaculum is a strong, fibrous band.
Convert the deep groove on the front of the carpal bones into a tunnel, the carpal tunnel, Flexor tendons of the digits & median nerve pass through.
The extensor retinaculum, holds the tendons of the extensor muscles in place. It is located on the back of the forearm & continuous with the ligament, which is located on the anterior side of the forearm.

20. Intrinsic muscles of the Hand
Thenar eminence:
Group of 3 muscles
O: carpals & metacarpals
I: 1st metacarpal & phalanges
Flex, abduct, oppose thumb
Hypothenar eminence:
group of 3 muscles
Flex, abduct, oppose little finger