What mammal has no 7 cervical vertebrae?
Most mammals have seven cervical vertebrae, with the only three known exceptions being the manatee with six, the two-toed sloth with five or six, and the three-toed sloth with nine.
What animals have 7 cervical vertebrae?
“Nearly all mammals have the same number of cervical vertebrae, no matter how long or short their necks are–humans, giraffes, mice, whales, and platypuses all have exactly seven cervical vertebrae,” explains co-author Jeff Spear, an NYU doctoral student.
What mammals have more than 7 cervical vertebrae?
The only mammals which have evolved different numbers of neck vertebrae without any apparent problems are sloths and manatees. Two-toed sloths (Choloepus) have 5-7 neck vertebrae while three-toed sloths (Bradypus) have 8 or 9.
Where is cervical vertebrae found in mammals?
The cervical vertebrae are the bones within the neck. The vertebrae are the bones that make up the backbone of vertebrate animals. These cervical bones are the smallest in the body in mammals, although they are not the smallest bones found within the animal.
Do all mammals have 7 cervical vertebrae?
The number of cervical vertebrae shows no variation and in fact remains constant in all mammals except Manatees and sloths. Manatees also known as sea cows are large slow moving aquatic mammals which are famous for possessing only six cervical vertebrae instead of seven. Hence, the correct answer is option (D).
Can you have 8 cervical vertebrae?
In the cervical region there are eight cervical nerve roots and only seven cervical vertebra. The first seven cervical nerve roots exit the spinal canal above their numbered vertebra. For example, the C1 root exits the spinal column between the occiput and the atlas (C1).
Do giraffes have 7 cervical vertebrae?
The giraffe possesses a unique body plan with an extraordinarily long and flexible neck. However, the giraffe neck, like the human, basically consists of just seven bony cervical vertebrae.
Which animal has the most cervical vertebrae?
A giraffe has the same number of neck vertebrae as a human, mouse, elephant, or armadillo; all have exactly seven. Sloths are an exception, with up to 10 vertebrae in their neck.
How many cervical vertebrae are there?
seven cervical vertebrae
The cervical spine, comprised of seven cervical vertebrae referred to as C1 to C7, is divided into two major segments: the craniocervical junction (CCJ) and the subaxial spine. The CCJ includes the occiput and the two most cephalad cervical vertebrae known as the atlas (C1) and the axis (C2).
Are there 7 or 8 cervical vertebrae?
In the cervical segments, there are 7 cervical vertebrae and 8 cervical nerves (Figure 3.2). C1-C7 nerves exit above their vertebrae whereas the C8 nerve exits below the C7 vertebra. It leaves between the C7 vertebra and the first thoracic vertebra.