Introduction: Wherever skin, muscles, or tendons need to slide over the bone is home to bursae. A bursa (singular) is a sac made of thin, slippery tissue. They could be compared to a blister as they are lubricated with a small amount of fluid inside their outer layer. A healthy bursa helps reduce friction created…
INTRODUCTION: A brachial plexus injury (BPI), also known as brachial plexus lesion, is an injury to the brachial plexus, the network of nerves that conducts signals from the spinal cord to the shoulder, arm and hand. These nerves originate in the fifth, sixth, seventh and eighth cervical (C5–C8), and first thoracic (T1) spinal nerves, and…
Introduction The Hypoglossal nerve is the twelfth cranial nerve, and innervates all the extrinsic and intrinsic muscles of the tongue, except for the palatoglossus which is innervated by the vagus nerve. It is a nerve with a sole motor function. Hypoglossal Nerve Anatomy The nerve arises from the hypoglossal nucleus in the medulla as a…
Introduction The accessory nerve is a cranial nerve that supplies the sternocleidomastoid and trapezius muscles. It is considered the eleventh of twelve pairs of cranial nerves, or simply cranial nerve XI, as part of it was formerly believed to originate in the brain. The accessory nerve divides it into a spinal part and a cranial…
INTRODUCTION The vagus nerve is the longest and most complex of the 12 pairs of cranial nerves that emanate from the brain. It transmits information to or from the surface of the brain to tissues and organs elsewhere in the body. The name “vagus” comes from the Latin term for “wandering.” This is because the…
INTRODUCTION : The glossopharyngeal nerve, known as the ninth cranial nerve (CN IX), is a mixed nerve that carries afferent sensory and efferent motor information. It exits the brainstem out from the sides of the upper medulla, just anterior (closer to the nose) to the vagus nerve. Sensory: Innervates the oropharynx, carotid body and sinus,…
Introduction The vestibulocochlear nerve (auditory vestibular nerve), known as the eighth cranial nerve, transmits sound and equilibrium (balance) information from the inner ear to the brain. The vestibulocochlear nerve is the eighth paired cranial nerve. It is comprised of two parts – vestibular fibres and cochlear fibres. Both have a purely sensory function. Anatomy The…
INTRODUCTION : The abducens nerve (or abducent nerve) is the sixth cranial nerve (CNVI), in humans body that controls the movement of the lateral rectus muscle, responsible for outward gaze. It is a somatic efferent nerve. ANATOMY OF ABDUCENS NERVE : The abducens nerve arises from the abducens nucleus in the pons of the brainstem….
INTRODUCTION: The frontalis muscle is a thin, wide, four-sided muscle located at the top front of the skull. The frontalis muscle only serves for facial expressions. It lifts the eyebrows while looking up thus creating a expression. ORIGIN: It originates from the Galea aponeutorica. INSERTION: This muscle has no bony attachments. The medial fibers continues…
INTRODUCTION : The trochlear nerve, also called the fourth cranial nerve or CN IV, is a motor nerve (a somatic efferent nerve) that innervates only a single muscle: the superior oblique muscle of the eye, which operates through the pulley-like trochlea. The trochlear nerve is unique among the cranial nerves in several respects: The trochlear…
