and movement of the body. There is a foramen magnum abstract of dissertation through which brain joins the spinal cord. The pericardium protects the heart from the shocks, and mechanical injuries and also allows its free movements. 1st: The first spinal nerve is also known as hypoglossal Nerve.
Utriculus, sacculus and legena also have sensory spots known as maculae. Each thyroid gland is situated behind the hyoid apparatus.
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The bulging of eye balls and raising up the throat help in pushing down the food towards the oesophagus. 4th, 5th and 6th: The 4th, 5th and 6th spinal nerves supply the skin and muscles of the body wall of the belly region. Claim your 7 day free access. The synangium bifurcates into two branches as aortic trunks. Urinogenital ducts: Each kidney gives rise to a muscular urinogenital duct at its outer border, which carries urine as well as sperms. As already mentioned in the excretory system, the two systems (excretory and reproductive) are closely associated with each other and form urinogenital system. Thus, both sensory and motor nerve fibres are present in this nerve.
Now the ventricle contracts and the backward flow of blood into auricles are prevented by the auriculoventricular valve. It is held and kept in position by the fibres of the suspensory ligament, which extend from the lens capsule to the ciliary body. Trigeminal Nerve: It divides into three branches: (i) Ophthalmic Nerve: It innervates the skin receptors of the snout. A pair of external nares (nostrils) is present at a short distance above the mouth. Habitat and Habits Frogs.
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