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Question 1
The obturator externus is innervated by which nerve division?
Correct Answer:
Posterior division of obturator nerve
Explanation:
Obturator externus receives motor input from branches of the obturator nerve that pass to the muscle after the nerve splits in the pelvis. The posterior division of the obturator nerve is the branch that supplies this deep medial thigh muscle, whereas the anterior division goes to other medial thigh muscles like adductor longus, adductor brevis, and gracilis. The femoral nerve serves the anterior thigh muscles, not obturator externus, and the sciatic nerve covers the posterior thigh and leg, not this muscle. So, the innervation of obturator externus by the posterior division of the obturator nerve best fits the anatomical pattern.
Question 2
What action does the iliacus perform at the hip?
Correct Answer:
Flexion and lateral rotation of thigh at hip
Explanation:
Hip flexion is the primary job of the iliacus, acting as part of the iliopsoas to pull the femur forward at the hip. When the thigh is flexed, its fibers also contribute to external (lateral) rotation due to their oblique orientation across the joint. It does not extend the hip, nor does it abduct or adduct the thigh, which are actions favored by other muscle groups. So the iliacus produces flexion of the thigh at the hip and can assist with external rotation when the thigh is flexed.
Question 3
The posterior division of the obturator nerve provides innervation to which portion of the adductor magnus?
Correct Answer:
Adductor Portion
Explanation:
The adductor magnus has two parts with different nerve supplies. The part that adducts the thigh (the adductor portion) receives motor fibers from the obturator nerve, specifically its posterior division. The other part, which is the hamstring portion, is supplied by the tibial portion of the sciatic nerve. So, the posterior division of the obturator nerve innervates the adductor portion of the adductor magnus. This dual innervation explains why hip adduction can be affected by obturator nerve injury (to the adductor part) while the hamstring-associated actions rely on the sciatic nerve.
Question 4
Gerdy's tubercle has what attached to it?
Correct Answer:
Iliotibial tract
Explanation:
Gerdy’s tubercle on the lateral proximal tibia is the insertion point for the iliotibial tract. This thick band of fascia lata, formed by the tensor fasciae latae and gluteus maximus, runs down the outer thigh and attaches here to help stabilize the knee by pulling on the lateral side of the tibia, especially when the leg is extended. The other options don’t attach there: the patellar ligament attaches to the tibial tuberosity in front, the popliteus tendon attaches to the posterior tibia, and the lateral knee fascia is a broader term not specifying this insertion.
Question 5
The articular surface of the sacrum has which joint attached on its anterior aspect?
Correct Answer:
Sacroiliac joint auricular (anterior)
Explanation:
The anterior surface of the sacrum carries the sacral auricular surface that articulates with the ilium, forming the sacroiliac joint. This joint is the interface between the sacrum and the pelvic bone, allowing transfer of weight from the spine to the pelvis. The other options don’t fit: the hip joint involves the femoral head and acetabulum, the lumbar facet joints are between lumbar vertebrae, and the pubic symphysis is a midline cartilaginous joint between the pubic bones.
Question 1
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About this Exam

Prepare with the Gross Anatomy Dry Laboratory Lower Body Practice Test practice quiz. This question bank includes 10 questions covering action, perform, obturator, nerve, and division. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Gross Anatomy Dry Laboratory Lower Body Practice Test

This practice set contains 10 questions from the matching question bank and focuses on action, perform, obturator, nerve, and division. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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