Anatomy of "Magic Wands"

Anatomy of "Magic Wands" 

Part-3

In this part of the series the topic of discussion will be one of the most interesting topics of  human anatomy- neurology. We are going to explore the nervous paradigm of hand and arm to get a deeper understanding that how those strong muscles that we talked about earlier move and co-ordinate. The significance of nervous paradigm of a working arm and hand is that it not only receipts the orders from brain but also transmits the first stimuli from the fore limbs. 

   

 The Musculocutaneous Nerve

 The main nerves of the fore limb are musculocutaneous nerves from the cervical and the thorax of the the spinal chord. It obliquely passes between the biceps brachii and brachialis. It is almost hidden and rarely gets damaged. It is the main supplier for the interior compartment of the hand muscles. It also branches along the interior compartment. The medical conditions for this nerve are also very rare because of the fact that it is covered by the exterior compartment. But some damage may occurs due to hypertrophy or stress of localized muscle tissue.  

The Radial Nerve 

Radial nerve supplies to the posterior portion of the upper limb controlling the 12  muscles of the posterior oestofascial compartment and the dorsal muscles. It is one of the major nerves of the upper limb and is subdivided into many branches. It passes through the inter muscular gaps near the triceps brachii and enters the grove of humerus to the fore arm. In the fore arm the nerve divides into

Muscle Supplied by Radial nerve

superficial branches of upper set  which is the sensory set and deep set  which is primarily the motor set. The deep branches of the radius nerve induces the supinator muscles and upper, the nail bead and some finger sections including middle, index fingers.

    

      The radial nerve being one of the most important nerves is also prone to serious medical conditions and injuries. Any kind damage in the radial nerve can lead to loss of sensation in the fore arm, weakness, loss of supinator control and eventually a complete motor failure while using radial induced muscle sets.

 

The Median Nerve

Median Nerve

The median nerve is one of the main nerves originating from the brachial plexus. It passes through the carpel tunnel into the hand. The median nerve has no voluntary function in the brachium. It basically induces the flexor groups of the fore arm including flexors like- 

• digitorum superfacialis,

•  flexor digitorum profundus

 It also supplies to the Superficial groups like-

• Pronator treres

• flexor carpi radialis

• Palmaris longus

The most common disorder with the median nerve is the carpal tunnel syndrome about which I have already discussed in my earlier posts.

The Ulnar Nerve

The ulnar nerve is called so because it runs really close to the ulna bone. The interesting thing about this nerve is that it passes between the medial epicondyle and the skin over that. Sometimes if we are struck over that spot a sensation of a electric shock passing through the fore arm is felt. This point is called funny point. 

 Muscles supplied

• Flexor Carpi Ulnaris

• Flerxor Digitorum Profundus

• Opponens digiti mini

• Dorsal and Palmar interossei.