Tag: circulatory system and organs

Carnassial teeth. which are pointed molars, would most likely be part of the dentition of a carnivore

A wisdom tooth or third molar is one of the three molars per quadrant of the human dentition. It is the most posterior of the three. Wisdom teeth generally erupt between the ages of 17 and 25

• The digestive glands (salivary glands, pancreas, liver, and gallbladder) produce or store secretions that the body carries to the digestive tract in ducts and breaks down chemically. 
• The teeth help in mechanical digestion by masticating (chewing) food.
•  The whole process starts in the oral cavity, where the saliva from the salivary glands mixes with the food and starts to begin the breakdown of food. This semi-digested food then travels down to the small intestine, where secretions from the liver, gallbladder, and pancreas further act on the food particles. Hence, Teeth are not only part of the digestive system that physically breaks down food.

Humans have four types of teeth, namely incisors, canines, premolars and molars. Each type of teeth has specific structure and function. The roots of teeth are embedded in the upper jaw and the lower jaw. Humans have 32 teeth, 8 incisors, 4 canines, 8 premolars and 12 molars. Canines and premolars have one root. Upper first premolars and lower molars have two roots. Upper molars have three roots.

Incisors are the front four teeth which are used for cutting/biting and slicing the food, canines are the pointed teeth which helps in tearing the food whereas molars are the teeth which are used for Grinding and chewing of food particles. 

A diastema is a gap between teeth mostly seen in the front teeth. It mainly occurs in mammals mostly in humans. It is caused by missing of teeth or undersized teeth.

The arrival of second teeth occurs at 6 years +/- 6 months. With the exception of the wisdom teeth, the last of the secondary teeth come in around 12 years of age. 

Carnassial teeth are the molar and premolar teeth modified for shearing flesh by having cusps with sharp cutting edges. They are typical of animals of the order carnivora (e.g., tigers, wolves), in which they are the first molars in the lower jaw and the last premolars in the upper.

Incisors are the most anterior teeth. Canines - all mammals have a single canine in each quadrant. The premolars lie immediately posterior to the canines. In the upper jaw, they are found in the maxillary. The most posterior teeth in the jaws of most mammals are molars. Humans have two incisors, one canine, two premolars, and three molars, I2 C1 P2 M3, in each quadrant of their upper jaws. The numbers for each quadrant of the lower jaw are the same, and the general formula is written I2/2 C1/1 P2/2 M3/3.