What does reticular mean in anatomy?

reticular fibre, in anatomy, fine fibrous connective tissue occurring in networks to make up the supporting tissue of many organs. The reticular fibres are composed of randomly oriented collagenous fibrils lying in an amorphous matrix substance.

What’s reticular mean?

adjective. having the form of a net; netlike. intricate or entangled. Anatomy. of or relating to a reticulum.

What does the reticular formation means?

Definition of reticular formation

: a mass of nerve cells and fibers situated primarily in the brain stem that plays an important role in controlling autonomic functions (such as respiration), reflexive movement, posture and balance, and consciousness and the sleep-wake cycle.

What is the meaning of concentrically?

1 : having a common center concentric circles the concentric layers of the wedding cake. 2 : having a common axis : coaxial.

What is reticular formation in brain?

Reticular formation circuitry helps to coordinate the activity of neurons in these cranial nerve nuclei, and thus is involved in the regulation of simple motor behaviors. The reticular formation contains long ascending (i.e. traveling to the brain) and descending (i.e. traveling from the brain to the body) tracts.

What is a reticular pattern?

The reticular appearance refers to a collection of innumerable small linear opacities that together produce an appearance resembling a “net”. The pattern can be fine, medium or coarse. Fine and medium patterns are shown here. Reticular patterns represent interstitial lung disease.

How many reticular formations are there in the brain?

Function. The reticular formation consists of more than 100 small neural networks, with varied functions including the following: Somatic motor control – Some motor neurons send their axons to the reticular formation nuclei, giving rise to the reticulospinal tracts of the spinal cord.

Where is reticular tissue?

Reticular tissue, a type of loose connective tissue in which reticular fibers are the most prominent fibrous component, forms the supporting framework of the lymphoid organs (lymph nodes, spleen, tonsils), bone marrow and liver.

What is the function of reticular fibers?

Reticular fibers crosslink to form a fine meshwork (reticulin). This network acts as a supporting mesh in soft tissues such as liver, bone marrow, and the tissues and organs of the lymphatic system.

What is the purpose of the hindbrain?

hindbrain, also called rhombencephalon, region of the developing vertebrate brain that is composed of the medulla oblongata, the pons, and the cerebellum. The hindbrain coordinates functions that are fundamental to survival, including respiratory rhythm, motor activity, sleep, and wakefulness.

What is the ascending arousal system?

The ascending reticular activating system (ARAS) mediates arousal, an essential component of human consciousness. Each pathway contained different distributions of fiber tracts from known neurotransmitter-specific ARAS nuclei in the brainstem.

What part of the brain controls wakefulness and arousal?

The hypothalamus, a peanut-sized structure deep inside the brain, contains groups of nerve cells that act as control centers affecting sleep and arousal.

What does im mean in improvise?

C19: from French, from Italian improvvisare, from Latin imprōvīsus unforeseen, from im- (not) + prōvīsus, from prōvidēre to foresee; see provide.

What does concentric ring mean?

Concentric circles are circles with a common center. The region between two concentric circles of different radii is called an annulus. Any two circles can be made concentric by inversion by picking the inversion center as one of the limiting points.

What does it mean to be zealous?

1 : filled with or showing a strong and energetic desire to get something done or see something succeed The police were zealous in their pursuit of the criminals. 2 : marked by passionate support for a person, cause, or ideal a zealous fan. Other Words from zealous. zealously adverb.

What stimulates the reticular activating system?

The DA system is tonically activated by excitatory stimuli via sustained increases in DA neuron firing or via presynaptic stimulation of DA terminals by glutamate (Grace, 2000).

How does the reticular activating system keep you awake?

The reticular activating system (RAS) is a complex bundle of nerves in the brain that’s responsible for regulating wakefulness and sleep-wake transitions. 1 It functions as a filter out unnecessary noise that can interfere with the processing of messages or slow the processing of messages during sleep.

How is the reticular formation used in everyday life?

The reticular formation also plays a role in controlling the muscles of facial expression when associated with emotion. For example, when you smile or laugh in response to a joke, the motor control to your facial muscles is provided by the reticular formation on both sides of the brain.