1.	Neurocranium
The neurocranium forms the cranial cavity that surrounds and protects the brain and brainstem. The neurocranium is formed from the occipital bone, two temporal bones, two parietal bones, the sphenoid, ethmoid and frontal bones; they are all joined together with sutures. 
Components of neurocranium: Neurocranium consists of 8 parts: frontal, sphenoid, ethmoid, occipital, 2 temporal, and 2 parietal bones.

Viscerocranium
The viscerocranium bones form the anterior and lower regions of the skull and include the mandible, which attaches through the only truly motile joint found in the skull. The facial skeleton contains the vomer, two nasal conchae, two nasal bones, two maxilla, the mandible, two palatine bones, two zygomatic bones, and two lacrimal bones. 
    Components of viscerocranium : The face is made of 2 nasal, 2 lacrimal, 2 palantine, 2 inferior nasal concha, 2 zygomatic, 2 maxilla, 1 mandible, and 1 vomer.
 
 2. The femoral triangle is a wedge-shaped area formed by a depression between the muscles of the thigh. It is located on the medial aspect of the proximal thigh.
It is the region of the passage of the main blood vessels between the pelvis and the lower limb, as well as a large nerve supplying the thigh. The borders of the femoral triangle can be remembered using the word SAIL, as demonstrated in the table above. As well as these boundaries, the femoral triangle also has a floor and a roof. The floor is comprised of four muscles that can be easily remembered by using the mnemonic APPI (adductor longus, pectineus, psoas major and illiacus muscles). The roof is formed by the fascia lata, superficial fascia, and the skin. The apex of the triangle is pointed downwards towards the adductor canal. The femoral nerve is the most lateral of the contents in the femoral triangle. It supplies the sartorius, rectus femoris, vastus lateralis, vastus intermedius and vastus medialis muscles in the anterior compartment of the thigh, and the pectineus muscle in the medial compartment. It originates from the union of the L2, L3, L4 spinal cord segments in the lumbar plexus on the posterior abdominal wall. It enters the thigh by passing deep to the inguinal ligament.

 3. Hamstring muscles and quadricep femoris
      Quadriceps Femoris: It has four parts: rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius.
       Hamstring Muscles: Semimembranosus, semitendinosus and bicep femoris. 

	4.	Corona Virus affects the organs of the respiratory system which includes the lungs, pharynx, larynx, trachea, and bronchi.