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what makes up the Thenar group?
Flexor Pollicis Brevis
Abductor Pollicis Brevis
Opponens Pollicis
What does the muscles of the thenar group have in common?
O: Flexor retinculum, scaphoid, trapezium
Inn: Median Nerve
Blood supply: Radial Artery
What is A? ( Origin, insertion, action, and innervation)
Abductor pollicis brevis
O: Flexor retinculum, scaphoid, trapezium
Ins: Lateral aspect of proximal phalanx
Act: abducts thumb at CMC joint
Inn: Median Nerve
What is B? ( Origin, insertion, action, and innervation)
Flexor pollicis brevis
O: Flexor retinculum, scaphoid, trapezium
Ins: proximal phalanx
Act: Flexes thumb at CMC/MCP joint
Inn: Median Nerve
What muscle is this?
Opponens pollicis
O: Flexor retinculum, scaphoid, trapezium
Ins: Lateral aspect of 1st metacarpal
Act: opposes thumb at CMC joint
Inn: Median Nerve
What makes up the hypothenar muscles?
Flexor Digiti Minimi brevis
Abductor digiti Minimi brevis
Opponens digiti minimi brevis
What is C? ( Origin, insertion, action, and innervation)
Abductor digiti minimi Brevis
O: pisiform
Ins: Medial 5th proximal phalanx
Act: abduct little finger at MCP joint
Inn: Ulnar Nerve
What is D? ( Origin, insertion, action, and innervation)
Flexor digiti minimi Brevis
O: Hamate and flexor retinaculum
Ins: base 5th proximal phalanx
Act: flexes little finger at MCP joint
Inn: Ulnar Nerve
What is A?( Origin, insertion, action, and innervation)
Opponens digiti minimi Brevis
O: Hamate and flexor retinaculum
Ins: Medial 5th metacarpal
Act: opposes little finger at MCP joint
Inn: Ulnar Nerve
What is E?
Opponens digiti minimi Brevis
What is B?
flexor digit minimi brevis
What is C?
Abductor digit minimi brevis
What is this? ( Origin, insertion, action, and innervation)
Lumbricals
O: Tendons of flexor digitorum profundus for 2-5 digits
Ins: Extensor expansion digits 2-5
Act: Flexes at MCPS, Extends at PIPs. DIP of digits 2-5
Inn: Median (1&2) ;Ulnar Nerve (3&4)
What muscle flexes MCP and extends Intephalangeals ?
Lumbricals
What is the green?
Dorsal interossei
What muscle is this? ( Origin, insertion, action, and innervation)
Dorsal interossei
O: Adjacent metacarpals
Ins: bases of proximal phalanges and extensor expansion of digits 2-4
Act: abducts fingers 2-4 at MCPs
Inn: Ulnar Nerve
What is B? ( Origin, insertion, action, and innervation)
Palmar interossei
O: 2nd, 4th, 5th, metacarpals
Ins: bases of proximal phalanges and extensor expansion of digits 2, 4 and 5
Act: adducts fingers 2, 4, and 5 at MCPs
Inn: Ulnar Nerve
What is A? (Origin, insertion, action, and innervation)
Adductor Pollicis
O: base of 2nd and 3rd metacarpal and ANT surface of 3rd metacarpal
Ins: medial base of 1st proximal phalanx
Act: adducts thumbs at CMC joints
Inn: Ulnar Nerve
What group is pink and Blue?
Pink = Thenar muscles
Blue = Hypothenar muscles
Label each muscle
flexor pollicis brevis
abductor pollicis brevis
Opponens pollicis
flexor digitorum minimi brevis
abductor digitorum minimi
Opponens digitorum minimi
What nerve innervates the posterior forearm?
Radial Nerve
What muscle is A? (Origin, insertion, action, innervation)
Extensor carpi radialis longus
O: Lateral supracondylar ridge
Ins: Base of 2nd metacarpal
Act: Extension and assist in radial deviation at Radiocarpal joint
Inn: Radial Nerve
What muscle is B? (Origin, insertion, action, innervation)
Extensor carpi radialis brevis
O: Lateral epicondyle
Ins: Base of 3rd metacarpal
Act: Extension and assist in radial deviation at Radiocarpal joint
Inn: Radial Nerve
What is muscle C? (Origin, insertion, action, innervation)
Extensor Digitorum
O: Lateral epicondyle
Ins: extensor expansion
Act: Extension MCP, PIP, and DIP joint of 2-5 , Extension of radiocarpal joint
Inn: Radial Nerve
What is muscle D? (Origin, insertion, action, innervation)
Extensor carpi ulnaris
O: Lateral epicondyle and posterior ulna
Ins: Base of 5th metacarpal
Act:Extension and assist with ulnar deviation at Radiocarpal joint
Inn: Radial Nerve
What is muscle A ? (Origin, insertion, action, innervation)
Extensor digiti minimi
O: Lateral epicondyle
Ins: 5th phalanx extensor
Act:Extension 5th MCP and Extension of radiocarpal joint (weak)
Inn: Radial Nerve
What is muscle B?
extensor carpi ulnaris
What is muscle C?
extensor Carpi radialis longus
What is D?
extensor carpi radialis brevis
What is E?
Extensor digitorum
What is A? (Origin, insertion, action, innervation)
Supinator
O: Lateral epicondyle
Ins: Lateral surface of proximal 1/3 radius
Act: supination of forearm
Inn: Radial Nerve
what is B? (Origin, insertion, action, innervation)
abductor pollicis Longus
O: mid-ulna, radius, and interosseous membrane
Ins: base of 1st metacarpal
Act: Abduct thumb at CMC
Inn: Radial Nerve
What is C? (Origin, insertion, action, innervation)
Extensor pollicis Longus
O: Posterior mid-ulna and interosseous membrane
Ins: base of distal phalanx of thumb
Act: extends thumb at IP , MCP, and CMC
Inn: Radial Nerve
What is D?(Origin, insertion, action, innervation)
extensor indicis
O: Posterior ulna
Ins: distal phalanx via tendon of extensor digitorum
Act: extends index finger at DIp, Pip, MCP and extension of wrist
Inn: Radial Nerve
What is E?
Extensor Carpi radialis
What is F ? (Origin, insertion, action, innervation)
Extensor Pollicis brevis
O: Posterior distal radius and interosseous membrane
Ins: base of proximal phalanx of thumb
Act: extension thumb at MCP and CMC
Inn: Radial Nerve
What is the green line pointing to?
Flexor carpi ulnaris
Anatomical Snuff box ( boundaries and contents)
Lateral: extensor pollicis brevis and abductor pollicis longus
Medial: extensor pollicis longus
Floor: scaphoid
Contents: Radial Artery
What muscles make up the superficial compartment of Anterior forearm
Pronator teres, flexor carpi radialis, Palmaris longus, and Flexor carpi ulnaris.
What muscle is the yellow arrow pointing at ? (Origin, insertion, action, innervation)
Brachioradialis
O: Lateral supracondylar ridge
Ins: Lateral distal radial styloid
Act: Flexes elbow joint
Inn: Radial Nerve
what is muscle A?(Origin, insertion, action, innervation)
Pronator Teres
O: Medial Epicondyle of humerus
Ins: Mid-Lateral surface of radius
Act: Pronates forearm at superior radioulnar joint
Inn: Median Nerve
What are the boundaries and contents of the cubital Fossa?
Lateral: brachioradialis
Medial: Pronator teres
Superior: Line connecting medial and lateral epicondyle
Contents:
tendons: biceps
Artery: Brachial
Nerve: Median
What is muscle B?(Origin, insertion, action, innervation)
Flexor Carpi radialis
O: Medial Epicondyle
Ins: 2nd and 3rd metacarpals
Act: flexes and assist with radial deviation
Inn: Median Nerve
what is muscle C?(Origin, insertion, action, innervation)
Palmaris Longus
O: Medial Epicondyle
Ins: flexor retinculum and palmar aponerosis
Act: Weak wrist flexion at radiocarpal joint
Inn: Median Nerve
What is muscle D?(Origin, insertion, action, innervation)
Flexor carpi ulnaris
O: Medial Epicondyle and olecranon
Ins: Pisiform, hamate, 5th metacarpal
Act: flexes and assist with radial deviation at radiocarpal joint
Inn: ulnar Nerve
What muscle makes up the intermediate compartment of the Anterior forearm?
Flexor digitorum superficialis
what muscle is it pointing at?(Origin, insertion, action, innervation)
Flexor digitorum superficialis
O: Medial Epicondyle, radius, and coronoid process
Ins: middle phalanx 2-5
Act: Flexes MCP And PIP of 2-5, Flexes at Radiocarpal joint
Inn: Median Nerve
What muscles make up the deep compartment of the Anterior forearm?
Flexor digitorum profundus, Flexor pollicis longus, and pronator quadratus
What is the blue line pointing at?(Origin, insertion, action, innervation)
Flexor digitorum profundus
O: Anterior medial ulna
Ins: distal phalanges 2-5
Act: Flexes MCP, PIP, and DIP joints of digits 2-5
Inn: Lateral ½ -Median Nerve, Medial ½ - Ulnar nerve
What is the green line pointing at? (Origin, insertion, action, innervation)
Flexor Pollicis Longus
O: Anterior radius and interosseous membrane
Ins: base of distal phalanx of thumb
Act: Flexes MCP,IP, and CMC joints of digits thumb
Inn: Median Nerve
What is the blue box? (Origin, insertion, action, innervation)
Pronator Quadratus
O: distal ulnar shaft
Ins: distal radial shaft
Act:Pronates forearm at inferior radioulnar joint
Inn:Median Nerve
Boundaries and contents of Carpal tunnel
Lateral: trapezium
Medial: Hamate
Floor: Hamate, capitate, and trapezoid
Roof: flexor retinculum
Contents:
9 tendons and 1 nerve
4- FDS
4-FDP
1-FPL
Median nerve
Note
Flashcard