The Guyon Canal, also known as the ulnar canal or Canal of Guyon, is a narrow passageway located in the wrist, specifically at the ulnar side. Named after French surgeon Jean Casimir Félix Guyon, who extensively studied the anatomy of the hand, this canal serves as a conduit for the ulnar nerve and artery as…
The cephalic vein is a superficial vein of the upper limb and one of the arm’s two primary veins. Because the vein goes up to the shoulder, its name is derived from the word ‘cephalic,’ which means “head.” The superficial venous network provides blood for most blood tests and is the most convenient location to…
Introduction In routine dental practice, the most common anesthetic procedure used by dentists is the inferior alveolar nerve block. Sufficient temporary anesthesia is provided by the inferior alveolar nerve block for several surgical operations. In order to provide a local anesthetic solution close to the nerve’s entrance into the inferior alveolar canal, a needle is…
Introduction The top portion of the superior trunk of the brachial plexus gives rise to the long thoracic nerve, also known as the external respiratory nerve of Bell or the posterior thoracic nerve. This nerve normally receives support from cervical nerve roots C5, C6, and C7. The long thoracic nerve travels along the chest wall…
What Is the Peripheral Nervous System? The peripheral nervous system (PNS) is a vital part of the nervous system, responsible for connecting the central nervous system (CNS) to the rest of the body. It comprises a network of nerves and ganglia that relay information between the brain and spinal cord and the sensory organs, muscles,…
Deep Branch of Radial Nerve Anatomy Origin and Course At the cubital fossa, the radial nerve splits into a superficial (sensory) and deep (motor) branch. The deep branch of the radial nerve extends downhill between the superficial and deep layers of muscles to the center of the forearm after winding around the lateral side of…
The posterior interosseous nerve (PIN) is a branch of the radial nerve, a major nerve in the upper limb. It is an important nerve that supplies several muscles in the forearm, playing a crucial role in hand and wrist movements. After crossing the supinator muscle, it is the deep branch of the radial nerve that…
Introduction The phrenic nerve plays a key part in breathing or respiration. It creates your diaphragm to contract and expand, providing your lungs capacity to inhale and exhale air. Nerve damage can create a paralyzed diaphragm. You may feel short of breath and carry problems sleeping. An irritated phrenic nerve can create persistent hiccups. The…
The medial pectoral nerve is a branch of the brachial plexus, a network of nerves that originates from the spinal cord in the neck and innervates the upper limb. Along with the lateral pectoral nerve, it is one of the pectoral nerves that supply the muscles in the chest area. Particular muscles in the chest…
Introduction The anterior divisions of the 7th, 8th, 9th, 10th, and 11th thoracic intercostal nerves extend anteriorly from the intercostal spaces into the abdominal wall and are hence directed to as thoracoabdominal nerves/thoracoabdominal intercostal nerves. They obey a similar course as the upper intercostal nerves until they reach the anterior ends of the intercostal spaces….
