In the newborn, intramuscular phytonadione (vitamin K) is administered into which muscle?

A) Deltoid
B) Dorsogluteal
C) Vastus medialis
D) Vastus lateralis

Phytonadione

A vitamin K1 form, used to treat and prevent vitamin K deficiencies which are essential for blood clotting.

Dorsogluteal

Pertaining to the buttock region, historically a common site for intramuscular injections, though less favored now due to risk of injury.

Vastus Lateralis

The largest and most powerful part of the quadriceps muscle, located on the side of the thigh.