Use the numbers of NCERT: 8 cranial bones, 14 facial bones, 1 hyoid, 6 ear ossicles, 26 vertebral…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Use the numbers of NCERT: cranial bones, facial bones, hyoid, ear ossicles, vertebral units, sternum and ribs.
- How many bones are in the skull, when the hyoid and the ear ossicles are counted with it?
- How many bones are in the vertebral column, the sternum and the ribs together?
- How many bones are in the axial skeleton?
Need a reminder? The key ideaShow
The skeleton has bones. The axial skeleton has bones: the skull ( cranial and facial bones), the hyoid (), the ear ossicles (), the vertebral column ( units: cervical, thoracic, lumbar, sacral, coccygeal), the sternum () and pairs of ribs (). Ribs: pairs true, pairs false, pairs floating.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. The numbers above.
Plan. Add the parts in groups.
Step 1. The skull. bones.
Step 2. The trunk. bones.
Step 3. The axial skeleton. bones.
Answer: bones; bones; bones.
Check. is the number that NCERT gives for the axial skeleton.
Watch out. NCERT calls only the cranial and the facial bones, in all, the skull proper, and adds the hyoid and the ear ossicles to the count. A question that asks for the skull bones may mean . Read the question for which parts it counts.
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