1) It is immunization day at the health center. The first patient is a 2-month old well female infant who is scheduled for the following vaccinations: pneumococcal conjugate vaccine (PCV), pentavalent vaccine (Penta) and oral polio vaccine. PCV and Penta are given via intramuscular route. Where are the sites of injection? What muscle is targeted in the injection? Write down its origin, insertion and action. How do you locate this area?
Muscle targeted
> vastus lateralis
Origin
> greater trochanter and linea aspera of femur
Insertion
> patella via quadriceps tendon and the tibial tuberosity via patellar ligament
Action
> extend leg at knee joint
How to locate
> outer middle third of the vastus lateralis
2) The baby’s 65-year-old grandfather also came to the center because influenza vaccine is being offered to senior citizens. The flu vaccine is given intramuscularly. Which muscle is the preferred site for IM injection in this case? Write down its origin, insertion and action. How do you locate this area?
Muscle Targeted
> deltoid muscle
Origin
> acromial extremity of clavicle (anterior fibers), acromion of scapula (lateral fibers), and spine of scapula (posterior fibers)
Insertion
> deltoid tuberosity of humerus
Action
> lateral fibers abduct arm at shoulder joint; anterior fibers flex and medially rotate arm at shoulder joint; posterior fibers extend and laterally rotate arm at shoulder joint
How to locate
> middle of the deltoid muscle; put three fingers below the acromion process (across the deltoid muscle)