Corona Radiata
Corona Radiata is a collection of nerve fibers present in the brain that carries messages between the brain cells of the cerebral cortex and the brain stem. Both brain stem and cerebral cortex play a role in motor function and sensation and it is the corona radiata that links both sensory and motor nerve pathways between these structures.
Neuron Structure
A neuron is defined as the functional unit of the body system called the nervous system. It is significant in transmitting signals that include receiving and sending the signals from a portion of the brain. The neurons are considered specialized cells in terms of their structure.
Afferent Neurons
Neurons are electrically excitable cells in the body specialized for receiving and transmitting information. They are referred to as the structural units of the nervous system. The important parts of a neuron include the cell body, dendrites, and axons.
Motor Homunculus
The term homunculus is Latin and is referred to as ‘little man’. In neuroanatomy, the cortical homunculus is either the motor or sensory distribution along the cerebral cortex of the brain. It was discovered by the great scientist ‘Wilder Penfield and Edwin Boldrey in the year 1937. It is a map that corresponds body part to touch sensitivity. The proportion of the sensory cortex to the size of the body region is irregular. For example, a small area is devoted to sensations that are arising from the trunk, and a large cortical area is devoted to the face and lips.
Nervous System
The nervous system is the portion of an animal's body that controls and transmits signals between various parts of the body. The central nervous system (CNS) and the peripheral nervous system (PNS) are the two primary components of the nervous system in vertebrates. The brain and spinal cord are housed in the CNS. The PNS is made up primarily of nerves, which are long fibers that link the CNS to every other part of the body, but it also includes peripheral ganglia, sympathetic and parasympathetic ganglia, and the enteric nervous system, which is a semi-independent part of the nervous system that regulates the gastrointestinal system.
Options:
- ○ auditory tube
- ○ cochlea
- ○ semicircular canals
- ○ vestibule
**Explanation of Diagram:**
The image depicts a model of the human ear, which includes various anatomical structures. An arrow is pointing to a specific part of the ear. Key components illustrated in the model include:
- **Outer Ear:** Visible as the external part funneling sound waves inward.
- **Middle Ear:** Containing the eardrum and auditory bones.
- **Inner Ear:** Includes structures such as the cochlea, semicircular canals, and vestibule.
The structure indicated by the arrow is part of the inner ear, involving the vestibular system responsible for balance and spatial orientation.
**Identified Structure:**
Based on typical ear anatomy, the arrow points to the **semicircular canals**, which are responsible for detecting head movements and maintaining balance.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe502db8b-dcb1-4cc2-973f-1027c5543a56%2Fdbf68cfb-d0a6-4b27-9ae8-c5473fa66782%2Fs1gvgg7_processed.png&w=3840&q=75)
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