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Upper & Lower limb MCQs Q/A-3
The goal of this Website is not merely to get the correct answer and test knowledge, but to promote a greater understanding of this broad field of medicine. Upper & Lower limb MCQs Q/A-3 Optimal learning requires an appreciation of why the other choices are incorrect. Students are encouraged to read the answers and rationales for all of the questions to solidify and add to their understanding. If the student finds that he or she is missing questions in one particular area, further study in that area is encouraged.
- Ulnar deviation (also known as wrist adduction) includes paired contraction of which of the following muscle groups?
A) Flexor carpi ulnaris (FCU) and extensor carpi ulnaris (ECU)
B) ECU and palmaris longus (PL)
C) ECU and extensor pollicis longus (EPL)
D) Extensor carpi radialis (ECR) and fl exor carpi radialis (FCR) - All of these are accessory muscles of inspiration except:
A) Sternocleidomastoid
B) Trapezius
C) Pectoralis major
D) Internal intercostals - The lumbar plexus (L1–L4) includes all of the following nerves except:
A) Ilioinguinal nerve
B) Iliohypogastric nerve
C) Lateral cutaneous nerve of the thigh
D) Posterior cutaneous nerve of the thigh - Which peripheral nerve supplies the brachialis muscle?
A) Median
B) Ulnar
C) Musculocutaneous
D) Axillary - Which trunk(s) of the brachial plexus contribute(s) to the radial nerve?
A) Upper and lower trunks
B) Upper and middle trunks
C) Lower trunk
D) Upper, middle, and lower trunks - Which muscle is an internal rotator of the hip?
A) Obturator internus
B) Semitendinosus
C) Quadratus femoris
D) Superior gemellus - What is the “terrible triad”?
A) Medial/lateral meniscal injury with anterior cruciate ligament (ACL) tear
B) ACL, medial collateral ligament (MCL), and medial meniscus injury
C) ACL, posterior cruciate ligament (PCL), lateral meniscus injury
D) ACL, MCL, and PCL - Which ligament is the weakest of the ankle ligaments?
A) Deltoid ligament
B) Calcaneofibular ligament
C) Anterior talofibular ligament
D) Posterior talofibular ligament - If someone has weak knee extension and hip flexion, what nerve is most likely injured?
A) Obturator nerve
B) Femoral nerve
C) Sciatic nerve
D) Tibial nerve - All of the following muscles involved in wrist and finger extension receive innervation from the
radial nerve except:
A) Extensor carpi radialis longus
B) Extensor carpi radialis brevis
C) Extensor digitiminimi
D) Extensor indicis - When palpating the thoracolumbar and sacral spine, which of the following statements regarding landmarks is incorrect?
A) Spinous process of T3 is at the level of the spine of the scapula
B) T8 is at the level of the inferior angle of the scapula
C) S2 is at the level of the posterior superior iliac spine
D) L2 is at the level of the iliac crests - Sacral plexus (L4–S4) includes all of the following nerves except:
A) Genitofemoral nerve
B) Superior and inferior gluteal nerves
C) Sciatic nerve
D) Pudendal nerve - Which peripheral nerve supplies the anconeus muscle?
A) Median
B) Ulnar
C) Musculocutaneous
D) Radial - What two tendons comprise the first dorsal compartment of the wrist?
A) Extensor pollicis brevis (EPB) and abductor pollicis longus (APL)
B) Extensor pollicis longus (EPL) and abductor pollicis brevis (APB)
C) Extensor carpi radialis longus and APL
D) Extensor carpi radialis brevis and APB - Which muscle is an external rotator of the hip?
A) Tensor fasciaelata
B) Gluteus maximus
C) Gluteus medius
D) Gracilis - Normal range of motion for the knee is:
A) 0° to 90°
B) 0° to 135°
C) 10° to 150°
D) 0° to 170°
8 ANATOMY - Which ligament stabilizes the medial ankle?
A) Posterior talofibular ligament
B) Deltoid ligament
C) Anterior talofibular ligament
D) Calcaneofibular ligament - A tibial nerve injury is characterized by:
A) Weak hip adduction
B) Weak foot eversion and dorsiflexion
C) Weak foot inversion and plantar flexion
D) Weak knee extension - All of the following muscles involved in wrist and finger flexion receive innervation from the
median nerve except:
A) Flexor carpi radialis (FCR)
B) Flexor carpi ulnaris (FCU)
C) Palmaris longus (PL)
D) Flexor pollicis longus (FPL) - When palpating the cervical spine, which of the following statements regarding landmarks is incorrect?
A) Transverse process of C2 is palpated at the angle of the mandible
B) The first palpable midline spinous process is of C2
C) C7 has the largest cervical spinous process, also known as the vertebra prominens
D) Thyroid cartilage is located at the level of C6, C7 anteriorly
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Upper & Lower limb MCQs Q/A-3 41 to 60 Questions and Answers
👉41 A) Paired contraction of the FCU and ECU causes ulnar deviation of the wrist.
👉42 D) The internal intercostals are accessory muscles used during expiration. In addition to the other choices, the external intercostals and scalene muscles serve as accessory muscles during inspiration. Diaphragmatic muscle contraction (innervated by the phrenic nerve) serves as the primary muscle of respiration during inspiration.
👉43 D) The posterior cutaneous nerve of the thigh (S1–S3) is part of the sacral plexus.
👉44 C) The brachialis muscle is supplied mainly by the musculocutaneous nerve. A small branch of the radial nerve may sometimes innervate the lateral portion of this muscle. The brachialis muscle originates at the lower half of the anterior humerus and inserts at the ulnar tuberosity.
👉45 D) The radial nerve originates from the C5 through T1 nerve roots and the posterior cord (originates from upper, middle, and lower trunk
👉46 B) The semitendinosus is an internal rotator of the hip. All the other muscles are external rotators.
👉47 B) This injury usually occurs because of a lateral blow to the knee causing a rupture in the ACL,MCL, and medial meniscus. This occurs when a lateral force is applied to the knee when the foot is fixed to the ground causing a rotational force to tear all three structures.
👉48 C) Most sprains affect the anterior talofibular ligament. The ligament comes under strain and is vulnerable to injury, particularly when the foot is inverted.
👉49 B) The femoral nerve is formed from the L2 through L4 nerve roots. The main motor component innervates the iliopsoas (hip flexor) and the quadriceps (knee extensor).
👉50 C) The extensor digiti minimi muscle is innervated by the ulnar nerve. All of the other choices are muscles that are innervated by the radial nerve. Other muscles innervated by the radial nerve include the extensor carpi ulnaris, the extensor digitorum communis, and the extensor pollicis longus.
👉51 D) L4 is at the level of the iliac crests.
👉52 A) The genitofemoral nerve is part of the lumbar plexus (L1–L4). The sacral plexus also includes the posterior cutaneous nerve of the thigh.
👉53 D) The anconeus muscle originates at the lateral epicondyle of the humerus and inserts along the lateral side of the ulna. This muscle functions in forearm extension as well as stabilization of the elbow joint against flexion or pronation-supination. The anconeus muscle is innervated by the radial nerve.
👉54 A) There are six dorsal compartments to the wrist. The first compartment houses the APL and the EPB tendons. This is the location where De Quervain’s tenosynovitis can occur.
👉55 B) The gluteus maximus is an external rotator of the hip. All the other muscles are internal rotators.
👉56 B) The normal range of motion of the knee is 0° to 135°.
👉57 B) The deltoid ligament functions to support the medial surface of the ankle. It helps to connect the tibia to the calcaneus, navicular, and talus bones.
👉58 C) The tibial nerve is comprised of L4 through S3 nerve roots. In the popliteal fossa, the nerve branches off to the gastrocnemius, popliteus, soleus, and plantaris muscles. The nerve’s primary actions are foot inversion and ankle plantar flexion.
👉59 B) The FCU is innervated by the ulnar nerve. All of the other choices are muscles that are innervated by the median nerve. The median nerve also innervates the fl exor digitorum superficialis. The flexor digitorum profundus is dually innervated by the median (second and third digit) and the ulnar nerves (fourth and fifth digit).
👉60 D) The thyroid cartilage is located at the level of C4, C5 anteriorly.