What is a sensillum?

Definition of sensillum : a simple epithelial sense organ of an invertebrate (such as an insect) usually in the form of a spine, plate, rod, cone, or peg that is composed of one or a few cells with a nerve connection.

How do sensilla work?

Hair sensilla respond to disturbances of air or fluid outside the animal, campaniform sensilla detect stress in the cuticle, and chordotonal sensilla respond to a variety of stimuli that originate inside or outside the body, including vibration and sound.

What is basiconic sensilla?

6.17. Basiconic sensillae are peg-like structures with a shaft that is generally much shorter than trichoid hair sensillae, often in the range of 30–50 μm (Newland, P. L. and Burrows, M., 1994).

What is the function of the Campaniform Sensilla in insects?

Campaniform sensilla are a class of mechanoreceptors found in insects, which respond to local stress and strain within the animal’s cuticle. Campaniform sensilla function as proprioceptors that detect mechanical load as resistance to muscle contraction, similar to mammalian Golgi tendon organs.

What is Chordotonal organ insect?

Chordotonal organs are stretch receptor organs found only in insects and crustaceans. They are located at most joints and are made up of clusters of scolopidia that either directly or indirectly connect two joints and sense their movements relative to one another.

What is insect Sclerotization?

Sclerotization is the process of cuticular hardening which typically occurs within a few hours after each moult, due to the formation of cross-links between catecholamines or other phenolics and the protein and chitin fibrillar components of the cuticular matrix.

Where is the location of tactile organs in insects?

Insect mechanoreceptors can be found almost anywhere on the surface of an insect’s body. They may act as tactile receptors, detecting movement of objects in the environment, or they may provide proprioceptive cues (sensory input about the position or orientation of the body and its appendages).

Where are sensilla located?

sound reception. Exceedingly sensitive organs called sensilla are concentrated in organs of hearing. These can be found on the bushy antennae of the male mosquito or tympanal organs in the front legs of crickets or in abdominal pits of grasshoppers and many moths.

How does Tympanal organ work?

A tympanal organ (or tympanic organ) is a hearing organ in insects, consisting of a membrane (tympanum) stretched across a frame backed by an air sac and associated sensory neurons. Sounds vibrate the membrane, and the vibrations are sensed by a chordotonal organ.

What is the lymphatic system?

The lymphatic system comprises lymph, lymphatic capillaries, lymphatic vessels, lymphatic nodes, and lymphatic ducts. It also consists of other organs and tissues like the spleen, thymus, tonsils, Peyer’s patches, etc. Lymph is a fluid connective tissue that flows inside the specialised vessels known as lymphatic vessels.

How do the functions of the lymphatic system complement the bloodstream?

The functions of the lymphatic system complement the bloodstream functions, as it regulates the balance of fluids in the body and filters the pathogens from the blood . The lymphatic system is a network of vessels and organs that regulates the amount of fluid in the human body and defends it against infections.

How does the lymphatic system protect the body from pathogens?

Protects your body against foreign invaders: The lymphatic system is part of the immune system. It produces and releases lymphocytes (white blood cells) and other immune cells that monitor and then destroy the foreign invaders — such as bacteria, viruses, parasites and fungi — that enter the body.

What are the efferent vessels of the lymphatic system?

The efferent vessels empty into the lymphatic trunks. The lymphatic trunks are named according to the region of the body that they drain the lymph from. There are four pairs of trunks: lumbar, bronchomediastinal, subclavian and jugular.