The correct answer is T4. The surface of the skin is divided into specific areas called dermatomes, which are derived from the cells of a somite. As a fetus the somite divides into 3 regions: (1) myotome, which forms  skeletal muscle; (2) dermatome, which forms the connective tissues, including the dermis; and (3) sclerotome, which gives rise to the vertebrae. A dermatome is an area of skin in which sensory nerves derive from a single spinal nerve root. For the nipple this area is T4. 

The correct answer is T6. The surface of the skin is divided into specific areas called dermatomes, which are derived from the cells of a somite. As a fetus the somite divides into 3 regions: (1) myotome, which forms  skeletal muscle; (2) dermatome, which forms the connective tissues, including the dermis; and (3) sclerotome, which gives rise to the vertebrae. A dermatome is an area of skin in which sensory nerves derive from a single spinal nerve root. For the xiphoid process this area is T6. 

The correct answer is T10. The surface of the skin is divided into specific areas called dermatomes, which are derived from the cells of a somite. As a fetus the somite divides into 3 regions: (1) myotome, which forms  skeletal muscle; (2) dermatome, which forms the connective tissues, including the dermis; and (3) sclerotome, which gives rise to the vertebrae. A dermatome is an area of skin in which sensory nerves derive from a single spinal nerve root. For the umbilicus this area is T10.

The olfactory nerve (cranial nerve I) passes through the cribriform plate of the ethmoid bone. As its name suggests, it provides us with our sense of smell. Cranial nerve II is synonymous with the optic nerve, and does not pass through the cribriform plate, but rather, the optic canal of the sphenoid bone. Cranial nerve V is the trigeminal nerve, and passes through multiple openings in the skull, but the cribriform plate is not one of them.

The cervical and lumbar enlargements give rise to the nerve roots of the brachial and lumbosacral plexuses, respectively. Additionally, the conus medullaris marks the end of the spinal cord. However, the cauda equina does not give rise to the cervical nerve roots. It is a collection of lumbosacral nerve roots arising from the conus medullaris.

The femoral nerve supplies the anterior compartment of the thigh (muscles that extend the knee). If the femoral nerve was injured there would be an inability to extend the knee.

The femoral nerve also provides sensation to the front and medial side of the thigh, shin, and arch of the foot.

The sciatic nerve is comprised of the common fibular and tibial portions, which give rise to nerves of the same name. Although not a direct branch of the sciatic nerve, the medial plantar nerve comes from the tibial nerve, which can be traced back to the tibial portion of the sciatic nerve. However, the inferior gluteal nerve does not arise from any part of the sciatic nerve. 

The anterior circumflex humeral artery branches from the axillary artery, and primarily supplies blood to the head of the humerus. The posterior circumflex humeral artery also arises from the axillary artery, and supplies blood to the teres minor and deltoid muscles, among others. The thoracoacromial artery branches off the axillary artery as well, supplying the deltoid, subclavius, and other muscles. The profunda brachii does not branch off the axillary artery, but the brachial artery.

The lateral compartment of the leg contains the fibularis longus and fibularis brevis. The muscles of the lateral compartment of the leg are responsible for eversion of the foot and weak plantarflexion of the ankle. The fibularis longus and fibularis brevis are innervated by the superficial fibular nerve (nerve roots L5, S1, S2). The arterial supply consists of perforating branches of the posterior tibial artery and the fibular artery. The great saphenous vein drains, not supplies various compartments of the leg.

The anterior compartment of the thigh is a fascial compartment that contains groups of muscles with their blood supply and nerves. The anterior compartment contains the sartorius muscle and the quadriceps muscles (rectus femoris, vastus lateralis, vastus intermedius, and vastus medialis). The iliopsoas is sometimes considered a component of the anterior compartment of the thigh. The function of the muscles of the anterior compartment is to extend the knee and flex the hip. The anterior compartment is innervated by the femoral nerve (however, the iliopsoas is not innervated by the femoral nerve and is innervated by ventral rami of L1-L3). The blood supply of the anterior compartment is the femoral artery. The femoral artery supplies blood to the anterior compartment and is the largest blood vessel of the lower limb. The gluteal arteries supply the posterior compartment of the lower limb.