Estimate the age of fetal development of the fetal skeleton in figure 18.5 and t

Question

Estimate the age of fetal development of the fetal skeleton in figure 18.5 and the one that is represented at your school. Estimate the age of the human fetus shown in figure 18.6. Use the data provided in table 18.1 for your determination of the estimates. Fetal skeleton in figure 18.5: _ Fetal skeleton at your school: _ Fetus in figure 18.6: _ Identity the fetal skeleton structures in figures 18.8 and 18.9. Label the fetal bones and fontanels by placing the correct numbers in the spaces provided

Explanation / Answer

b.

Sternum: it also called breastbone. The sternum is a long, flat bone, forming the middle portion of the front of the chest. The top of the sternum supports the collarbones and its edges join with the costal cartilages of the first seven pairs of ribs.

c.

Sacrum: it is a large, triangular bone at the base of the spine, that forms by the fusing of sacral vertebrae S1–S5, between 18 and 30 years of age. a triangular bone in the lower back formed from fused vertebrae and situated between the two hip bones of the pelvis.

d.

Anterior knee: Anterior to the knee is a bone called patella. The patella also known as the kneecap. It is a thick, circular-triangular bone which articulates with the thigh bone and covers and protects the anterior articular surface of the knee joint.

e.

Thoracic cage: Rib cage, also known as the thoracic cage, it is a bony and cartilaginous structure which surrounds the thoracic cavity and supports the pectoral girdle forming a core portion of the human skeleton. The thoracic cage forms the thorax portion of the body. It consists of the 12 pairs of ribs with their costal cartilages and the sternum

f.

Wrist carpals: Eight carpel bones that make up wrist. They are scaphoid, Lunate, Triquetrum, Pisiform, Trapezium, Trapezoid, Capitate and Hamate.

Ankle tarsals:

The tarsal bones of the foot are organized into three rows: proximal, intermediate, and distal. The proximal row contains the talus, which is the most superior of the tarsals and articulates with the tibia and fibula to form the ankle joint. The intermediate group contains only the navicular bone, which articulates with all of the tarsals with the exception of the calcaneus. There are four distal tarsals: the lateral cuboid and the three cuneiforms, located medially.

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