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The thenar eminence is the mound formed at the base of the thumb on the palm of the hand by the intrinsic group of muscles of the thumb. [1] The skin overlying this region is the area stimulated when trying to elicit a palmomental reflex. The word thenar comes from Ancient Greek θέναρ (thenar) 'palm of the hand'. [2]
The muscles of the thumb are nine skeletal muscles located in the hand and forearm. The muscles allow for flexion , extension , adduction , abduction and opposition of the thumb . The muscles acting on the thumb can be divided into two groups: The extrinsic hand muscles, with their muscle bellies located in the forearm, and the intrinsic hand ...
axial compression and rotation of cervical spine to the side of symptoms causes pain Stellwag's sign: Karl Stellwag von Carion: endocrinology: thyrotoxicosis: infrequent and/or incomplete blinking, accompanied by Dalrymple's sign: Still's murmur: Sir George Frederick Still: paediatric cardiology: subaortic stenosis, small Ventricular septal defect
Control of more central axial and girdle muscles comes from the anterior corticospinal tract. [3] Damage to different parts of the body will cause deficits, depending on whether the damage is above (rostral) or below (caudal) the pyramidal decussation. Damage to the body above the pyramidal decussation will cause contralateral motor deficits.
The flexor pollicis longus (/ ˈ f l ɛ k s ər ˈ p ɒ l ɪ s ɪ s ˈ l ɒ ŋ ɡ ə s /; FPL, Latin flexor, bender; pollicis, of the thumb; longus, long) is a muscle in the forearm and hand that flexes the thumb. It lies in the same plane as the flexor digitorum profundus. This muscle is unique to humans, being either rudimentary or absent in ...
Untreated carpal tunnel syndrome, showing shrinkage (atrophy) of the muscles at the base of the thumb: Specialty: Orthopedic surgery, plastic surgery, neurology: Symptoms: Numbness, tingling in the thumb, index, middle finger, and half of ring finger. [1] [2] Causes: Compression of the median nerve at the carpal tunnel [1] Risk factors ...
In neuroanatomy, the trigeminal nerve (lit. triplet nerve), also known as the fifth cranial nerve, cranial nerve V, or simply CN V, is a cranial nerve responsible for sensation in the face and motor functions such as biting and chewing; it is the most complex of the cranial nerves.
Fractures of scaphoid can occur either with direct axial compression or with hyperextension of the wrist, such as a fall on the palm on an outstretched hand. Using the Herbert classification system, there are three main types of scaphoid fractures. 10%-20% of fractures are at the proximal pole, 60%-80% are at the waist (middle), and the ...