The Babinski reflex is a somatic reflex seen in infants. When the side of the foot is stroked, the toes spread apart. Another example of a somatic reflex is the ankle-jerk reflex, which causes the ankle to bend the foot towards the ground when the Achilles tendon is tapped.Know More
Somatic reflexes are movements of body parts that result nearly instantly when a certain stimulus is delivered. Reflexes are able to occur so quickly because the stimuli that cause them are not processed in the brain. Rather, the nerve impulse generated by the stimulus is relayed only to the spinal cord. A motor nerve impulse, which signals for the muscles to react in a certain way, is then sent back from the spinal cord to the muscle.
Humans display many different reflexes. The biceps reflex causes the forearm to jerk when the biceps brachii is tapped with a hammer. The corneal reflex causes a person to blink when the cornea of the eye is touched, and the knee-jerk reflex causes the lower leg to kick outward when the patellar tendon just beneath the knee cap is struck. Blushing is another reflex; the face turns red when a person experiences embarrassment or shame.Learn more about Nerves
The hippocampus helps to form memories and facilitate learning. Additionally, the hippocampus is part of the limbic system, and is heavily involved in producing emotions. If someone suffers damage to their hippocampus, it can cause them emotional or memory-related problems. Occasionally, people may lose their entire memory, resulting in a condition called amnesia.Full Answer >
The function of nervous tissue is to transmit and receive external and internal stimuli. Consisting of two basic types of cells, neurons and glial cells, nervous tissue represents a fundamental aspect of living organisms and can be considered the seat of response to stimuli. Signals from the internal or external environment are received by the neurons and then transmitted as electrical impulses to muscles, glands, the central nervous system or other neurons.Full Answer >
The reptilian brain is the complex found in mammal and bird brains that is analogous with the brain of a reptile. In humans, the reptile brain, or R-complex, is situated inferior to the cerebrum and includes the brain stem and the cerebellum.Full Answer >
The deltoid muscle is innervated by the axillary nerve. The deltoid is a triangular muscle located at the uppermost part of the arm and gives the shoulder its rounded contour. The axillary nerve extends from the brachial plexus, carrying nerve impulses to the deltoid muscle.Full Answer >