7/28 Questions Exam 1 Flashcards
What is the number of vertebrae in a typical adolescent?
33 segments
What is the number of vertebrae in a typical adult?
26 segments
What constitutes the spine?
the 24 presacral segments; the cervical, thoracic, and lumbar vertebrae
How many segments unite to form the typical sacrum?
5 segments
How many segments unite to form the typical coccyx?
4 segments
Which mammals do not have seven cervical vertebrae?
the two toed sloth, manatee, ant bear, and three toed sloth
Which mammals have more than seven cervical vertebrae?
the ant bear and three-toed sloth
Which mammals have less than seven cervical vertebrae?
the manatee and two-toed sloth
What does the term “cervical refer to?
the region of the neck
What does the term “thoracic” refer to?
breast plate or chest; it referred to the armor bearing region of the torso
What other term is often used to identify the vertebral segments of the chest?
the dorsal segments; the dorsals
What is the typical number of segments in the dorsal or thoracic region?
12 segments
What does the term “lumbar” refer to?
the loin; the region between the rib and the hip
What is the typical number of segments in the lumbar region?
5 segments
What does the term “sacrum” refer to?
the holy bone or holy region
What does the term “coccyx” refer to?
a cuckoo birds’ bill or cuckoo birds’ beak
What is the length of a typical male spinal column?
about 70 centimeters or 28 inches
What is the length of a typical female spinal column?
about 60 centimeters or 25 inches
What is the length difference between a typical male and typical female spinal column?
about 3 inches
What is the length of the male cervical region?
about 12 centimeters or 5 inches
What is the length of the male thoracic region?
about 28 centimeters or 11 inches
What is the length of the male lumbar region?
about 18 centimeters or 7 inches
What is the length of the male sacrum?
about 12 centimeters or 5 inches
Based on the numbers for individual regions of the vertebral column, what is the length of the male spine?
about 58 centimeters or 23 inches
What levels of the vertebral column specifically accommodate weigh-bearing transfer?
S1-S3 at the auricular surface
What organ(s) is (are) specifically associated with the horizontal axis of the skull?
the eye and the vestibular apparatus of the inner ear
Invagination of ectoderm along the primitive streak gives rise to what embryonic structure?
notochord
What is the name given to the mesoderm that will give rise to the vertebral column?
paraxial mesoderm
