Describe the nerve supply of skeletal muscle. Skeletal muscle is supplied by somatic nerves. The nerve to a skeletal muscle is a mixed nerve containing 60% motor and 40% sensory fibers. Motor supplyRead More…
Muscle Classification – Based on Action
Classify Skeletal Muscles According to Their Action. Skeletal muscles are classified on the basis of action as follows: a. Prime movers Muscles that are responsible for the initiation and maintenance of theRead More…
Skeletal Muscle – Parts and Classification
What are the parts of Skeletal Muscle? Skeletal muscle consists of two parts: • Fleshy part – is the contractile part called as muscle belly. • Fibrous part – is the non-contractileRead More…
Referred Pain
What is the anatomical basis of referred pain? The pain arising from diseased viscera is referred to the skin which is innervated by the same spinal segment/s that supply the diseasedRead More…
Upper and Lower Motor Neuron – Lesions
What are upper and lower motor neurons? Upper and lower motor neurons control the voluntary movements. Upper motor neurons are located mainly in the primary motor and premotor areas of cerebrum. LowerRead More…
Synapses – Definition, Types and Structure
Define synapse and describe its features. The junction between two neurons across which the nerve impulse passes from one neuron to another is called synapse. There is no actual contact between theRead More…
Autonomic Nervous System – Sympathetic and Parasympathetic
What are the functions and subdivisions of Autonomic Nervous System? Autonomic nervous system (ANS): Controls involuntary activities of the body. It helps to maintain a constant internal body environment (homeostasis). It controlsRead More…
Typical Spinal Nerve
How Many Spinal Nerves are There? There are 31 pairs of spinal nerves, each pair is attached to a part of spinal cord called spinal segment. The 31 pairs of spinal nervesRead More…
Neuroglial Cells
What are neuroglial cells? Besides neurons, the other type of cells present in nervous system are glial or neuroglial cells.These cells form myelin, protect and support neurons.They are far more numerous than neuronsRead More…
Myelin and Neurilemma Sheaths
Describe in brief the myelin sheath and neurilemma? Myelin Sheath It is a laminated sheath made up of lipoproteins. Myelin sheath is formed by consecutive wrappings of Schwann cell membrane around theRead More…