Question 1

Which muscle is primarily responsible for abduction of the shoulder joint, and what is its insertion point?

Accepted Answer

Deltoid; inserts on the deltoid tuberosity

Question 2

A patient presents with difficulty flexing their elbow. Which muscle is most likely compromised, and what is its primary action?

Accepted Answer

Brachialis; flexion of the elbow

Question 3

Which synovial joint type allows for the greatest range of motion, and which joint in the upper limb exemplifies this?

Accepted Answer

Ball and socket; glenohumeral (shoulder) joint

Question 4

During a soccer game, a player injures the lateral collateral ligament (LCL) of the knee. Which bones are directly connected by this ligament?

Accepted Answer

Femur and fibula

Question 5

Which muscle group is responsible for extension of the knee, and what is the common insertion point for these muscles?

Accepted Answer

Quadriceps femoris; tibial tuberosity via patellar tendon

Question 6

A fracture of the surgical neck of the humerus may affect which nerve, and what is a likely clinical consequence?

Accepted Answer

Axillary nerve; loss of shoulder abduction

Question 7

Which bone feature is found on the femur and serves as the attachment site for the gluteus medius muscle?

Accepted Answer

Greater trochanter

Question 8

If the tibialis anterior muscle is paralyzed, which movement at the ankle will be most affected?

Accepted Answer

Dorsiflexion

Question 9

Which of the following correctly matches a muscle to its origin and primary action at the hip?

Accepted Answer

Gluteus maximus; origin: ilium and sacrum; action: extension and lateral rotation

Question 10

A patient with a fractured scaphoid bone will have pain in which region?

Accepted Answer

Wrist (proximal row of carpals)

Question 11

Which muscle is responsible for lateral rotation of the shoulder, and what is its origin?

Accepted Answer

Infraspinatus; origin: infraspinous fossa

Question 12

Which structure forms the socket of the hip joint, and what bone is it part of?

Accepted Answer

Acetabulum; coxal bone

Question 13

Which ligament prevents anterior displacement of the tibia relative to the femur?

Accepted Answer

Anterior cruciate ligament (ACL)

Question 14

A patient is unable to abduct their hip. Which muscle is most likely affected?

Accepted Answer

Gluteus medius

Question 15

Which muscle acts to flex both the hip and the knee, and what is its origin?

Accepted Answer

Sartorius; origin: ASIS (anterior superior iliac spine)

Question 16

Which bone feature is unique to the ulna and forms the point of the elbow?

Accepted Answer

Olecranon process

Question 17

Which muscle inserts on the radial tuberosity and is responsible for flexion of both the elbow and shoulder?

Accepted Answer

Biceps brachii

Question 18

Which nerve is most likely injured if a patient cannot extend their wrist, and which muscle group does it innervate?

Accepted Answer

Radial nerve; extensor muscles of the forearm

Question 19

Which muscle group is responsible for plantar flexion at the ankle, and what is the common insertion point?

Accepted Answer

Gastrocnemius and soleus; insert on calcaneus via Achille’s tendon

Question 20

A patient presents with loss of sensation and motor function in the posterior thigh and lower leg. Which nerve is most likely affected?

Accepted Answer

Sciatic nerve

BIO 203 Practical Exam Study Guide: Musculoskeletal Structures of Upper and Lower Extremities

Study Guide - Practice Questions