Updated: 12/28/2021

Flexor Pollicis Brevis

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                        Summary
                    
                        Flexor Pollicis Brevis
                    
                        Origin
                    
                        Superficial head: Flexor retinaculum and tubercles of scaphoid and trapezium
                    
                        Deep head: Trapezoid and Capitate (more medial than superficial head)
                    
                        Insertion
                    
                        Lateral side of base of proximal phalanx of thumb
                    
                        Action
                    
                        Flexes thumb
                    
                        Innervation
                    
                        Superficial head: recurrent branch of the median nerve (C8, T1)
                    
                        Deep head: deep branch of ulnar nerve.
                    
                        Arterial Supply
                    
                        Superficial palmar branch of the radial artery

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Action	Numeric Key	Letter Key	Function Key
Show Bullets		S	Enter (frontside only)
20%	1	N
40%	2	H
60%	3	F	Enter (backside only)
80%	4	E
100%	5	M
Toss	0	T

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Anatomy⎪Flexor Pollicis Brevis

Anatomy
- Flexor Pollicis Brevis

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Flexor Pollicis Brevis
Origin	Superficial head: Flexor retinaculum and tubercles of scaphoid and trapezium Deep head: Trapezoid and Capitate (more medial than superficial head)
Insertion	Lateral side of base of proximal phalanx of thumb
Action	Flexes thumb
Innervation	Superficial head: recurrent branch of the median nerve (C8, T1) Deep head: deep branch of ulnar nerve.
Arterial Supply	Superficial palmar branch of the radial artery