EMRCS ANATOMY 4 Flashcards
An 83 year old lady presents with a femoral hernia and undergoes a femoral hernia repair. Which of the following forms the posterior wall of the femoral canal?
Pectineal ligament Lacunar ligament Inguinal ligament Adductor longus Sartorius
Borders of the femoral canal Laterally Femoral vein Medially Lacunar ligament Anteriorly Inguinal ligament Posteriorly Pectineal ligament
A 45 year man presents with hand weakness. He is given a piece of paper to hold between his thumb and index finger. When the paper is pulled, the patient has difficulty maintaining a grip. Grip pressure is maintained by flexing the thumb at the interphalangeal joint. What is the most likely nerve lesion?
Posterior interosseous nerve Deep branch of ulnar nerve Anterior interosseous nerve Superficial branch of the ulnar nerve Radial nerve
Anterior interosseous nerve
This is a description of Froment’s sign, which tests for ulnar nerve palsy. It mainly tests for the function of adductor pollicis. This is supplied by the deep branch of the ulnar nerve. Remember the anterior interosseous branch (of the median nerve), which innervates the flexor pollicis longus (hence causing flexion of the thumb IP joint), branches off more proximally to the wrist.
Which of the following cranial foramina pairings are incorrect?
Carotid canal and internal carotid artery. Foramen ovale and mandibular nerve. Optic canal and ophthalmic artery. Optic canal and ophthalmic nerve. Foramen rotundum and maxillary nerve.
The optic canal transmits the optic nerve. The ophthalmic nerve traverses the superior orbital fissure.
A 22 year old man is involved in a fight and sustains a stab wound in his upper forearm. On examination there is a small, but deep laceration. There is an obvious loss of pincer movement involving the thumb and index finger with minimal loss of sensation. The most likely nerve injury is to the:
Ulnar nerve Radial nerve Anterior interosseous nerve Axillary nerve Median nerve
The anterior interosseous nerve is a motor branch of the median nerve just below the elbow. When damaged it classically causes:
Pain in the forearm
Loss of pincer movement of the thumb and index finger (innervates the long flexor muscles of flexor pollicis longus & flexor digitorum profundus of the index and middle finger)
Minimal loss of sensation due to lack of a cutaneous branch
A 66 year old man is undergoing a left nephro-ureterectomy. The surgeons remove the ureter, which of the following is responsible for the blood supply to the proximal ureter?
Branches of the renal artery External iliac artery Internal iliac artery Direct branches from the aorta Common iliac artery
The proximal ureter is supplied by branches from the renal artery
Which of the following structures does not pass behind the lateral malleolus?
Peroneus brevis tendon Sural nerve Short saphenous vein Peroneus longus tendon Tibialis anterior tendon
Tibialis anterior tendon passes anterior to the medial malleolus
A 63 year old man is admitted with severe headache, nausea and recent epileptic fit. Fundoscopy shows papilloedema. He is also noted to have diplopia. Which of the cranial nerves listed accounts for the latter?
Abducens Optic Oculomotor Facial Trigeminal
The long intracranial course of this nerve makes it susceptible to damage early in the course of raised ICP.
A 78 year old man presents with symptoms consistent with intermittent claudication. To assess the severity of his disease you decide to measure his ankle brachial pressure index. To do this you will identify the dorsalis pedis artery. Which of the following statements relating to this vessel is false?
It originates from the peroneal artery It is crossed by the tendon of extensor hallucis brevis Two veins are usually closely related to it It passes under the inferior extensor retinaculum The tendon of extensor digitorum longus lies lateral to it
The dorsalis pedis artery is a direct continuation of the anterior tibial artery.
Which of the following is not a content of the anterior triangle of the neck?
Vagus nerve Submandibular gland Phrenic nerve Internal jugular vein Hypoglossal nerve
The phrenic nerve is a content of the posterior triangle. The anterior triangle contains the carotid sheath and its contents.
A 32 year old attends neurology clinic complaining of tingling in his hand. He has radial deviation of his wrist and there is mild clawing of his fingers, with the 4th and 5th digits being relatively spared. What is the most likely lesion?
Ulnar nerve damage at the wrist Ulnar nerve damage at the elbow Radial nerve damage at the elbow Median nerve damage at the wrist Median nerve damage at the elbow
Ulnar nerve damage at the elbow
The ulnar paradox- the higher the lesion, the less the clawing of the fingers seen clinically.
At the elbow the ulnar nerve lesion affects the flexor carpi ulnaris and flexor digitorum profundus.
A 22 year old man is undergoing an endotracheal intubation. Which of the following vertebral levels is consistent with the origin of the trachea?
C2 T1 C6 C4 C3
The trachea commences at C6. It terminates at the level of T5 (or T6 in tall subjects in deep inspiration).
A young child undergoes a difficult craniotomy for fulminant mastoiditis and associated abscess. During the procedure the trigeminal nerve is severely damaged within Meckels cave. Which deficit is least likely to be present?
Anaesthesia over the ipsilateral anterior aspect of the scalp Loss of the corneal reflex Weakness of the ipsilateral masseter muscle Anaesthesia of the anterior aspect of the lip Anaesthesia over the entire ipsilateral side of the face
The angle of the jaw is not innervated by sensory fibres of the trigeminal nerve and is spared in this type of injury.
Remember the trigeminal nerve provides motor innervation to the muscles of mastication. The close proximity of the site of injury to the motor fibres is likely to result in at least some compromise of motor muscle function.
Which of the following is not a branch of the external carotid artery?
Facial artery Lingual artery Superior thyroid artery Mandibular artery Maxillary artery
External carotid artery branches mnemonic:
Mandibular artery
‘Some Angry Lady Figured Out PMS’
Superior thyroid (superior laryngeal artery branch) Ascending pharyngeal Lingual Facial (tonsillar and labial artery) Occipital Posterior auricular Maxillary (inferior alveolar artery, middle meningeal artery) Superficial temporal
A 23 year old man is stabbed in the groin, several structures are injured and the adductor longus muscle has been lacerated. Which of the following nerves is responsible for the innervation of adductor longus?
Femoral nerve Obturator nerve Sciatic nerve Common peroneal nerve Ilioinguinal nerve
The adductors are innervated by the obturator nerve
Which of the following statements relating to the basilar artery and its branches is false?
The superior cerebellar artery may be decompressed to treat trigeminal neuralgia Occlusion of the posterior cerebral artery causes contralateral loss of the visual field The oculomotor nerve lies between the superior cerebellar and posterior cerebral arteries The posterior inferior cerebellar artery is the largest of the cerebellar arteries arising from the basilar artery The labyrinthine branch is accompanied by the facial nerve
The posterior inferior cerebellar artery is the largest of the cerebellar arteries arising from the vertebral artery. The labyrinthine artery is long and slender and may arise from the lower part of the basilar artery. It accompanies the facial and vestibulocochlear nerves into the internal auditory meatus. The posterior cerebral artery is often larger than the superior cerebellar artery and it is separated from the vessel, near it’s origin, by the oculomotor nerve. Arterial decompression is a well established therapy for trigeminal neuralgia.
Which of the following muscles does not recieve any innervation from the sciatic nerve?
Semimembranosus Quadriceps femoris Biceps femoris Semitendinosus Adductor magnus
The sciatic nerve is traditionally viewed as being a nerve of the posterior compartment. It is known to contribute to the innervation of adductor magnus (although the main innervation to this muscle is from the obturator nerve). The quadriceps femoris is nearly always innervated by the femoral nerve.
A 23 year old man is involved in a fight and is stabbed in his upper arm. The ulnar nerve is transected. Which of the following muscles will not demonstrate compromised function as a result?
Flexor carpi ulnaris Medial half of flexor digitorum profundus Palmaris brevis Hypothenar muscles Pronator teres
Pronator teres is innervated by the median nerve. Palmaris brevis is innervated by the ulnar nerve
Which of the structures listed below overlies the cephalic vein?
Extensor retinaculum Bicipital aponeurosis Biceps muscle Antebrachial fascia None of the above
None of the above
The cephalic vein is superficially located in the upper limb and overlies most the fascial planes. It pierces the coracoid membrane (continuation of the clavipectoral fascia) to terminate in the axillary vein. It lies anterolaterally to biceps.
Which of the following pairings are incorrect?
Aortic bifurcation and L4 Transpyloric plane and L1 Termination of dural sac and L4 Oesophageal passage through diaphragm and T10 Transition between pharynx and oesophagus at C6
Dural sac terminates at S2, which is why it is safe to undertake an LP at L4/5 levels. The spinal cord itself terminates at L1.
A 22 year old man is involved in a fight. He sustains a laceration to the posterior aspect of his wrist. In the emergency department the wound is explored and the laceration is found to be transversely orientated and overlies the region of the extensor retinaculum, which is intact. Which of the following structures is least likely to be injured in this scenario?
Dorsal cutaneous branch of the ulnar nerve Tendon of extensor indicis Basilic vein Superficial branch of the radial nerve Cephalic vein
Tendon of extensor indicis
The extensor retinaculum attaches to the radius proximal to the styloid, thereafter it runs obliquely and distally to wind around the ulnar styloid (but does not attach to it). The extensor tendons lie deep to the extensor retinaculum and would therefore be less susceptible to injury than the superficial structures.
