Nervous System Physiology

Cockroaches have highly developed sensory structures called cerci at their posterior end, which are extremely sensitive to air movements and slight positional changes. This allows them to detect approaching predators quickly. They cannot hear ultrasonic sounds (some bats can), cannot survive in all conditions, and option C is most accurate.

The origin of dental pain is interpreted by mesencephalic nucleus of brain.

The hindbrain (rhombencephalon) consists of the medulla oblongata, pons, and cerebellum. The thalamus is part of the diencephalon (forebrain/midbrain region), not the hindbrain. It acts as a relay station for sensory and motor signals to the cerebral cortex.

The cerebellum is the brain region responsible for balance, coordination, and fine motor control. The cerebrum handles higher functions, medulla controls vital functions, and hypothalamus regulates homeostasis - none specifically coordinate balance and movement.

Subependymal giant cell astrocytomas (SEGAs) are low-grade brain tumors strongly associated with tuberous sclerosis, and they almost classically arise near the foramen of Monro.

CSF is produced by the choroid plexus, NOT the arachnoid villi. Arachnoid villi are the site of CSF absorption into the venous sinuses. The other statements are correct: CSF leakage does cause headache (low pressure headache), neutrophils are normally absent (predominantly lymphocytes and monocytes), and CSF pH is slightly lower (more acidic) than blood pH.

The medulla oblongata is the most vital part of the brain because it contains centres controlling essential autonomic functions: respiratory centre (breathing), cardiovascular centre (heart rate, blood pressure), vomiting centre, and reflex centres like coughing, sneezing, and swallowing. Damage to the medulla is incompatible with life. The cerebrum (conscious thought, voluntary movement) and cerebellum (coordination, balance) are important but not immediately vital. The thalamus is a sensory relay station, not a vital centre.

The medulla oblongata contains the cardiac center that regulates heart rate and force of contraction. The cerebrum controls higher cognitive functions, the cerebellum coordinates movement, and optic lobes (in non-mammals) process visual information.

Duramater is the outermost and toughest layer of the meninges covering the brain and spinal cord. The meningeal layers from outermost to innermost are: duramater, arachnoid, and piamater. Choroid refers to the vascular layer of the eye.

Alpha waves (8-13 Hz) are present during relaxed wakefulness and disappear entirely during sleep. Beta waves (alert wakefulness) decrease but don't completely disappear. Theta and delta waves actually appear or increase during various stages of sleep.

The right cerebral hemisphere is primarily responsible for face recognition and processing visual patterns. The left hemisphere is more involved in language and analytical processing. Face recognition is part of the right hemisphere's specialization for visuospatial processing.

The corpus striatum (basal ganglia) is located deep within the cerebral hemispheres of the forebrain. Paracoel (lateral ventricle), diocoel (third ventricle), and metacoel (fourth ventricle) are all ventricles (fluid-filled cavities), not locations where the corpus striatum is found.

Medulla oblongata controls the respiration in humans.

Pituitary gland is a pea-sized structure located at the base of the brain.

The sodium potassium pump is an electrogenic active transport mechanism that expels 3 sodium ions out of the cell for every 2 potassium ions it brings in.