flexor retinaculum

Flexor RetinaculumFlexor Retinaculum

It’s a Fibrous band bridging the It’s a Fibrous band bridging the anterior concavity of the carpas, anterior concavity of the carpas, forming a tunnel called Carpal forming a tunnel called Carpal tunnel.tunnel.

AttachmentsAttachments

Medial = Pisiform, Hook of HamateMedial = Pisiform, Hook of Hamate

Lateral = Tub. Of Scaphoid, Crest of Lateral = Tub. Of Scaphoid, Crest of TrapeziumTrapezium

Flexor RetinaculumFlexor Retinaculum

Relations of Flexor Relations of Flexor RetinaculumRetinaculum

SuperficialSuperficial

Tendon of palmaris longus, palmar Tendon of palmaris longus, palmar cutaneous branches of median & ulnar cutaneous branches of median & ulnar nerves, ulnar nerve & ulnar vesselsnerves, ulnar nerve & ulnar vessels

DeepDeep

Median nerve, tendons of flexor Median nerve, tendons of flexor digitorum, flexor digitorum profundus, digitorum, flexor digitorum profundus, flexor pollicis longus, ulnar & radial flexor pollicis longus, ulnar & radial bursabursa

Carpal tunnel bonesCarpal tunnel bones

Tub. Of Scaphoid, Crest of Tub. Of Scaphoid, Crest of Trapezium, Pisiform & Hook of Trapezium, Pisiform & Hook of Hamate.Hamate.

Carpal tunnelCarpal tunnel

Thenar musclesThenar muscles

The following three muscles are considered part The following three muscles are considered part of the thenar eminence:of the thenar eminence:

Abductor Pollicis Brevis abducts the thumb. Abductor Pollicis Brevis abducts the thumb. This muscle is the most proximal of the thenar This muscle is the most proximal of the thenar group.group.

Flexor Pollicis Brevis, which lies next to the Flexor Pollicis Brevis, which lies next to the abductor, will flex the thumb, curling it up in abductor, will flex the thumb, curling it up in the palm.the palm.

Opponens Pollicis lies deep to abductor pollicis Opponens Pollicis lies deep to abductor pollicis brevis. It opposes the thumb, bringing it against brevis. It opposes the thumb, bringing it against the fingers. This is a very important movement, the fingers. This is a very important movement, as most of our dexterity comes from this action.as most of our dexterity comes from this action.


Abductor Pollicis BrevisAbductor Pollicis Brevis

Origin = Tub. Of Scaphoid, Crest of Origin = Tub. Of Scaphoid, Crest of Trapezium, Flexor retinaculumTrapezium, Flexor retinaculum

Insertion = Lat. Side of base of Insertion = Lat. Side of base of proximal phalanx of the thumbproximal phalanx of the thumb

Nerve supply = Median nerve Nerve supply = Median nerve (C8,T1)(C8,T1)

Action = Abduction of thumbAction = Abduction of thumb


Flexor Pollicis BrevisFlexor Pollicis Brevis

O = Crest of Trapezium, Flexor O = Crest of Trapezium, Flexor retinaculum (Superficial head)retinaculum (Superficial head)

Trapezoid & Capitate (Deep head)Trapezoid & Capitate (Deep head)

I = Lat. Side of base of proximal I = Lat. Side of base of proximal phalanx of the thumbphalanx of the thumb

N.S = Median nerveN.S = Median nerve

Act. = Flexion of thumbAct. = Flexion of thumb


Opponens PollicisOpponens Pollicis

O = Crest of Trapezium, Flexor O = Crest of Trapezium, Flexor retinaculumretinaculum

I = Lat. Half of the palmar surface I = Lat. Half of the palmar surface of the 1of the 1stst metacarpal bone metacarpal bone

N.S = Median nerve (C8,T1)N.S = Median nerve (C8,T1)

Act. = Opposition of thumbAct. = Opposition of thumb

Hypothenar musclesHypothenar muscles

Hypothenar refers to a group of 4 Hypothenar refers to a group of 4 muscles of the palm that control the muscles of the palm that control the motion of the little finger.motion of the little finger.

The 4 muscles are:The 4 muscles are:

Palmaris Brevis, Abductor Digiti Palmaris Brevis, Abductor Digiti Minimi, Flexor Digiti Minimi, Minimi, Flexor Digiti Minimi, Opponens Digiti MinimiOpponens Digiti Minimi


Palmaris BrevisPalmaris Brevis

Origin = flexor retinaculum & Origin = flexor retinaculum & palmar aponeurosispalmar aponeurosis

Insertion = Skin along medial Insertion = Skin along medial border of the handborder of the hand

Nerve supply = Ulnar nerve (C8,T1)Nerve supply = Ulnar nerve (C8,T1)

Action = GrippingAction = Gripping


Abductor Digiti MinimiAbductor Digiti Minimi

O = Pisiform, tendon of flexor carpi O = Pisiform, tendon of flexor carpi ulnaris, pisohamate ligamentulnaris, pisohamate ligament

I = Ulnar side of base of proximal I = Ulnar side of base of proximal phalanx of little fingerphalanx of little finger

N.S = Ulnar nerve (C8,T1)N.S = Ulnar nerve (C8,T1)

Act. = Abduction of little fingerAct. = Abduction of little finger


Flexor Digiti MinimiFlexor Digiti Minimi

O = Hook of Hamate, Flexor O = Hook of Hamate, Flexor retinaculumretinaculum

I = Ulnar side of base of proximal I = Ulnar side of base of proximal phalanx of little fingerphalanx of little finger


Act. = Flexion of little fingerAct. = Flexion of little finger


Opponens Digiti MinimiOpponens Digiti Minimi

O = Hook of Hamate, Flexor O = Hook of Hamate, Flexor retinaculumretinaculum

I = Medial surface of shaft of 5I = Medial surface of shaft of 5thth metacarpal bonemetacarpal bone


Act. = Flexion lateral rotation of 5Act. = Flexion lateral rotation of 5thth metacarpalmetacarpal

Carpal Tunnel SyndromeCarpal Tunnel Syndrome

Carpal Tunnel Syndrome (CTS), or Carpal Tunnel Syndrome (CTS), or median neuropathy at the wrist, is a median neuropathy at the wrist, is a medical condition in which the medical condition in which the median nerve is compressed at the median nerve is compressed at the wrist, leading to paresthesias, wrist, leading to paresthesias, numbness and musclenumbness and muscle weakness in weakness in the hand. the hand.

flexor retinaculum

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