The superficial branch continues the course of the radial nerve and enters the hand from the radial side. This branch is also known as the " sensory branch " because of its primary role to provide sensation to the thenar eminence and dorsal aspect of the radial 3 and a half digits of the hand. Brachial plexus Explore study unit.
The radial nerve is the largest terminal branch of the brachial plexus. It originates from the posterior cord along with the axillary nerve , carrying fibers from ventral roots of spinal nerves C5-C8 and T1. The radial nerve arises in the axilla, immediately posterior to the axillary artery , between coracobrachialis and teres major muscles.
The branches of the radial nerve provide motor supply for the posterior muscles of the arm and forearm , as well as the sensory supply of the skin of the arm, forearm and hand . Due to its length, the radial nerve is the most commonly injured nerve of the upper extremity. The most known presentation of radial nerve palsy is the "wrist drop".
The radial nerve is the most commonly injured nerve of the arm. The injuries of this nerve usually occur due to fractures of the humerus. The nerve can also be injured when it is "overused" (e.g. sports-related injuries) or compressed (e.g. improper use of crutches).
Upon crossing the cubital fossa, the radial nerv e terminates by dividing into two terminal branches: superficial (sensory) and deep (motor). Learning about the nervous system can be pretty scary. Try out nervous system quizzes and diagrams and soon you will see there’s nothing to be afraid of!
For example, if the nerve is injured in the axillary region, the sensory loss will be located at the lateral arm and the posterior aspect of the forearm radiating to the radial aspect of the hand and digits.
Upon entering the cubital region, and before its division, the radial nerve provides one more sensory branch called the posterior antebrachial cutaneous nerve. This nerve innervates a strip of skin down the middle of the posterior forearm. The deep branch, also known as the “motor branch”, provides motor innervation to the posterior compartment ...
The radial nerve is a major peripheral nerve of the upper limb. In this article, we shall look at the anatomy of the radial nerve – its anatomical course and its motor and sensory functions.
It therefore contains fibres from nerve roots C5 – T1. The nerve arises in the axilla region, where it is situated posteriorly to the axillary artery.
Motor functions – the triceps brachii and muscles in posterior compartment are affected. The patient is unable to extend at the forearm, wrist and fingers. Unopposed flexion of wrist occurs, known as wrist-drop. Sensory functions – all four cutaneous branches of the radial nerve are affected.
Posterior cutaneous nerve of forearm – Innervates a strip of skin down the middle of the posterior forearm. The fourth branch – the superficial branch – is a terminal division of the radial nerve. It innervates the dorsal surface of the lateral three and half digits and the associated area on the dorsum of the hand.
Injury to the radial nerve can be broadly categorised into four groups – depending on where the damage has occurred (and thus which components of the nerve have been affected).
Sensory – Innervates most of the skin of the posterior forearm, the lateral aspect of the dorsum of the hand, and the dorsal surface of the lateral three and a half digits. Motor – Innervates the triceps brachii and the extensor muscles in the forearm.
The radial nerve is tightly bound within the spiral groove of the humerus. Thus, it is most susceptible to damage with a fracture of the humeral shaft. Motor functions. The triceps brachii may be weakened, but is not paralysed (branches to the long and lateral heads of the triceps arise proximal to the radial groove).
The sensory root of your trigeminal nerve branches into the ophthalmic, maxillary, and mandibular divisions. The motor root of your trigeminal nerve passes below the sensory root and is only distributed into the mandibular division. VI. Abducens nerve.
This generates nerve impulses that are transmitted to the cochlear nerve. Vestibular portion. Another set of special cells in this portion can track both linear and rotational movements of your head. This information is transmitted to the vestibular nerve and used to adjust your balance and equilibrium.
Their functions are usually categorized as being either sensory or motor. Sensory nerves are involved with your senses, such as smell, hearing, and touch. Motor nerves control the movement and function of muscles or glands. Keep reading to learn more about each of the 12 cranial nerves and how they function.
The oculomotor nerve has two different motor functions: muscle function and pupil response. Muscle function. Your oculomotor nerve provides motor function to four of the six muscles around your eyes. These muscles help your eyes move and focus on objects.
What are cranial nerves? Your cranial nerves are pairs of nerves that connect your brain to different parts of your head, neck, and trunk. There are 12 of them, each named for their function or structure. Each nerve also has a corresponding Roman numeral between I and XII.
I. Olfactory nerve. The olfactory nerve transmits sensory information to your brain regarding smells that you encounter. When you inhale aromatic molecules, they dissolve in a moist lining at the roof of your nasal cavity, called the olfactory epithelium.
The vagus nerve is a very diverse nerve. It has both sensory and motor functions, including: communicating sensation information from your ear canal and parts of your throat. sending sensory information from organs in your chest and trunk, such as your heart and intestines.