Thenar Eminence - Muscles - Innervation

Innervation

The Opponens pollicis and Abductor pollicis brevis are normally innervated by the median nerve. The Flexor pollicis brevis can be innervated by the median or ulnar nerve. The adductor pollicis is typically innervated by the ulnar nerve. There are normal variations. In a Cannieu-Riche anastomasis, fibers from the deep palmar branch of the ulnar nerve innervate the opponens pollicis and/or abductor pollicis brevis. Regardless of their final innervation, the nerves that reach the thenar muscles arise from the C8 and T1 roots, pass through the lower trunk of the plexus, and then through the medial cord of the plexus.

The ulnar nerve is exclusively responsible for the innervations of the hypothenar eminence. Both nerves contribute to the innervations of the midpalmar group.

Flexor Pollicis Brevis (FPB) is typically an ulnar-innervated muscle. Due to a common interconnection between the Median and Ulnar nerves in the hand (Riche-Cannieu interconnection), the Median nerve may innervate the FPB in 35% of people. It is innervated by the Ulnar nerve in 50% of people and by both the Median and Ulnar nerves in 15%.

The muscles in this location are usually innervated by the recurrent branch of the median nerve. They all control movement of the thumb.

The innervation of these muscles by the median nerve is unusual, as most of the intrinsic muscles on the palm of the hand are supplied by the ulnar nerve. The lateral two lumbrical muscles are the other exception.

Read more about this topic:  Thenar Eminence, Muscles

Other articles related to "innervation":

Brachioradial Pruritis - Introduction
... Evidence exists that this reduction in cutaneous innervation occurs only during symptomatic flares, with innervation normalizing during symptom-free periods thus ... Abnormalities in cutaneous innervation have been documented ...
The Blitz (Thebandwithnoname Album)
... thebandwithnoname (referred to as "TBWNN" by fans) were a Christian band who were launched by Innervation Trust in March 2002, as their flagship band ... Innervation Trust is a Christian charity that recruited and resourced schools' teams, each dedicated to a major city in the UK ... Innervation Trust is the product of Mark Pennells and Zarc Porter, a songwriter/producer partnership also credited with writing most of the music for, and co-founding, the World Wide Message Tribe ...
Sole (foot) - Human Anatomy - Innervation
... The deep fibular nerve from the common fibular nerve provides the sensory innervation of the skin between the first and second toes and the motor innervation of ... The plantar digital nerves from the medial plantar nerve provide sensory innervation to the skin of the plantar aspect of the toes, except the medial part of the big toe and the lateral part of the little toe and ... The proper plantar nerve from the common plantar digital nerve provide sensory innervation to the plantar surface of the toes as well as the dorsal aspect of the distal ...
Cutaneous Innervation Of The Head
... Cutaneous innervation refers to the area of the skin which is supplied by a specific nerve ... The cutaneous innervation of the head is as follows Ophthalmic nerve (green) Maxillary nerve (pink) Mandibular nerve (yellow) Cervical plexus (purple) Dorsal rami of cervical nerves (blue) ...
Brachioradial Pruritus - Introduction
... Evidence exists that this reduction in cutaneous innervation occurs only during symptomatic flares, with innervation normalizing during symptom-free ... Abnormalities in cutaneous innervation have been documented ...