- Source: Recurrent branch of the median nerve
The recurrent branch of the median nerve is the branch of the median nerve which supplies the thenar muscles. It is also occasionally referred to as the thenar branch of the median nerve, or the thenar muscular branch of the median nerve.
Anatomy
= Course
=It usually passes distal to the transverse carpal ligament. It ends in the opponens pollicis.
= Distribution
=In the thenar eminence, the recurrent branch of the median nerve provides motor innervation to:
opponens pollicis muscle
abductor pollicis brevis muscle
superficial part of flexor pollicis brevis muscle
A separate, more proximal branch of the median nerve additionally provides motor innervation to the 1st and 2nd lumbricals of the hand. All other intrinsic muscles of the hand receive motor innervation via the ulnar nerve.
Clinical significance
The recurrent branch of the median nerve may be affected in carpal tunnel syndrome, or from its own separate peripheral neuropathies.
= Surgery
=The recurrent branch of the median nerve is also colloquially called the "Million Dollar Nerve", because injury to this nerve during carpal tunnel surgery can lead to a million dollar lawsuit. Injury to this nerve can lead to loss of function of the thumb. Such injury can happen if the flexor retinaculum is transected too radially. The possibility of injury to this nerve is even greater when it runs through the ligament without any curling at the distal part of the ligament.
See also
Median nerve
Thenar eminence
Abductor pollicis brevis muscle
Flexor pollicis brevis muscle
Opponens pollicis muscle
Nerve injury
Carpal tunnel surgery
References
External links
lesson5nervesofhand at The Anatomy Lesson by Wesley Norman (Georgetown University)
Kata Kunci Pencarian:
- Recurrent branch of the median nerve
- Median nerve
- Recurrent branch
- Opponens pollicis muscle
- Thenar eminence
- Abductor pollicis brevis muscle
- Flexor pollicis brevis muscle
- Composite muscle
- Ape hand deformity
- Palmar crease
