Write short notes on the following features of the eutherians(a) Dentition(b) Endoskeleton
Answers
Dentition: mammalian teeth (dentition) are very developed and specialized for particular diet. Mammals have four kinds of teeth:
i. Incisions: most interior teeth
ii. Canines: long, stout for catching, killing prey.
iii. Premolars: for chewing
iv. Molars: have broad chewing surface.
The Endo skeleton of eutherians show important modifications and consist of skull vertebral coloumn, trunk have thoracic and lumber region, pelvic and pectoral girdles.
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❤. DENTITION ❤
⭐. Dentition is the arrangement of teeth.
⭐. In eytheria dentition is the codont, heterodont and diphyodont.
⭐. Tge codont teeth are present in tgr sockets of bones ( Maxilla , dentary)
⭐. Heterodont - There are four types of teeth namely incisors, canines , premolars and molars.
⭐. Diphyodont - Two stes of teeth are formed during life time , milk dentition and permanent dentition.
❤. ENDOSKELETON ❤
⭐. Eutherian endoskeleton is bony.
⭐. The skull is dicondylic (as in amphibia).
⭐. Each half of lower jaw is formed of a single bone dentary.
⭐. The number of cervical vertebrae is always 7 except in choloepus(6), Trichechus(6) , Bradypus(9).
⭐. Sacral vertebrae are two to five .
⭐. Vertebrates are amphiatian ( centrum is flat anteriorly and posteriorly).
⭐. Ribs are double headed.