EMRCS ANATOMY 2 Flashcards
A 73 year old lady presents with symptoms of faecal incontinence. On examination she has weak anal sphincter muscles. What are the main nerve root values of the nerves supplying the external anal sphincter?
S2,3 L5, S1 S4,5 S5 S2,3,4
The external anal sphincter is innervated by the inferior rectal branch of the pudendal nerve, this has root values of S2, 3 and the perineal branch of S4.
A 22 year old falls over and lands on a shard of glass. It penetrates the palmar aspect of his hand, immediately lateral to the pisiform bone. Which of the following structures is most likely to be injured?
Palmar cutaneous branch of the median nerve Lateral tendons of flexor digitorum superficialis Ulnar artery Flexor carpi radialis tendons Lateral tendons of flexor digitorum profundus
The ulnar nerve and artery are at most immediate risk in this injury.
A 72 year old man has a fall. He is found to have a fractured neck of femur and goes on to have a left hip hemiarthroplasty. Two months post operatively he is found to have an odd gait. When standing on his left leg his pelvis dips on the right side. There is no foot drop. What is the cause?
Sciatic nerve damage L5 radiculopathy Inferior gluteal nerve damage Previous poliomyelitis Superior gluteal nerve damage
This patient has a trendelenburg gait caused by damage to the superior gluteal nerve causing weakness of the abductor muscles. Classically a patient is asked to stand on one leg and the pelvis dips on the opposite side. The absence of a foot drop excludes the possibility of polio or L5 radiculopathy.
Which of the following structures lies posterior to the femoral nerve in the femoral triangle?
Adductor longus Pectineus Psoas major Iliacus None of the above
The iliacus lies posterior to the femoral nerve in the femoral triangle. The femoral sheath lies anterior to the iliacus and pectineus muscles.
You are assisting in an open right adrenalectomy for a large adrenal adenoma. The consultant is distracted and you helpfully pull the adrenal into the wound to improve the view. Unfortunately this is followed by brisk bleeding. The vessel responsible for this is most likely to be:
Portal vein Phrenic vein Right renal vein Superior mesenteric vein Inferior vena cava
It drains directly via a very short vessel. If the sutures are not carefully tied then it may be avulsed off the IVC. An injury best managed using a Satinsky clamp and a 6/0 prolene suture
A 28 year old lady requires an episiotomy for a ventouse vaginal delivery. Which of the nerves listed below will usually be anaesthetised to allow the episiotomy?
Femoral Ilioinguinal Pudendal Genitofemoral Sacral plexus
The pudendal nerve innervates the posterior vulval area and is routinely blocked in procedures such as episiotomy.
A motorcyclist is involved in a road traffic accident. He suffers a complex humeral shaft fracture which is plated. Post operatively he complains of an inability to extend his fingers. Which of the following structures is most likely to have been injured?
Ulnar nerve Radial nerve Median nerve Axillary nerve None of the above
The radial nerve is responsible for innervation of the extensor compartment of the forearm.
Mnemonic for radial nerve muscles: BEST
B rachioradialis
E xtensors
S upinator
T riceps
An enthusiastic surgical registrar undertakes his first solo splenectomy. The operation is far more difficult than anticipated and the registrar leaves a tube drain to the splenic bed at the end of the procedure. Over the following 24 hours approximately 500ml of clear fluid has entered the drain. Biochemical testing of the fluid is most likely to reveal:
Elevated creatinine Elevated triglycerides Elevated glucagon Elevated amylase None of the above
During splenectomy the tail of the pancreas may be damaged. The pancreatic duct will then drain into the splenic bed, amylase is the most likely biochemical finding. Glucagon is not secreted into the pancreatic duct.
A 48 year old lady is undergoing an axillary node clearance for breast cancer. Which of the structures listed below are most likely to be encountered during the axillary dissection?
Cords of the brachial plexus Thoracodorsal trunk Internal mammary artery Thoracoacromial artery None of the above
The thoracodorsal trunk runs through the nodes in the axilla. If injured it may compromise the function and blood supply to latissimus dorsi, which is significant if it is to be used as a flap for a reconstructive procedure.
A 53 year old lady is recovering following a difficult mastectomy and axillary nodal clearance for carcinoma of the breast. She complains of shoulder pain and on examination has obvious winging of the scapula. Loss of innervation to which of the following is the most likely underlying cause?
Latissimus dorsi Serratus anterior Pectoralis minor Pectoralis major Rhomboids
Serratus anterior
Winging of the scapula is most commonly the result of long thoracic nerve injury or dysfunction. Iatrogenic damage during the course of the difficult axillary dissection is the most likely cause in this scenario. Damage to the rhomboids may produce winging of the scapula but would be rare in the scenario given.
How many phalanges are there in the hand?
14 12 13 10 8
Each digit has 3 phalanges, the thumb has two the total is therefore 14.
A 56 year old lady is referred to the colorectal clinic with symptoms of pruritus ani. On examination a polypoidal mass is identified inferior to the dentate line. A biopsy confirms squamous cell carcinoma. To which of the following lymph node groups will the lesion potentially metastasise?
Internal iliac External iliac Mesorectal Inguinal None of the above
Lesions distal to the dentate line drain to the inguinal nodes. Occasionally this will result in the need for a block dissection of the groin.
A 20 year old man is hit with a hammer on the right side of the head. He dies on arrival in the emergency department. Which of these features is most likely to be found at post mortem?
Hydrocephalus Supra tentorial herniation Laceration of the middle meningeal artery Sub dural haematoma Posterior fossa haematoma
Laceration of the middle meningeal artery
This will account for the scenario given where there is a brief delay prior to death. The other options are less acute and a supratentorial herniation would not occur in this setting.
Which of the following ligaments contains the artery supplying the head of femur in children?
Transverse ligament Ligamentum teres Iliofemoral ligament Ischiofemoral ligament Pubofemoral ligament
Head of femur ligament (ligamentum teres): acetabular notch to the fovea. Contains arterial supply to head of femur in children.
A 72 year old man develops a hydrocele which is being surgically managed. As part of the procedure the surgeons divide the tunica vaginalis. From which of the following is this structure derived?
Peritoneum External oblique aponeurosis Internal oblique aponeurosis Transversalis fascia Rectus sheath
The tunica vaginalis is derived from peritoneum, it secretes the fluid that fills the hydrocele cavity.
Internal spermatic fascia Transversalis fascia
Cremasteric fascia From the fascial coverings of internal oblique
External spermatic fascia External oblique aponeurosis
Which of the following statements relating to the right phrenic nerve is false?
It lies deep to the prevertebral layer of deep cervical fascia Crosses posterior to the 2nd part of the subclavian artery It runs on the anterior surface of the anterior scalene muscle On the right side it leaves the mediastinum via the vena cava hiatus at a level of T8 The right phrenic nerve passes over the right atrium
The phrenic nerve passes with the internal jugular vein across scalenus anterior. It passes deep to prevertebral fascia of deep cervical fascia.
Left: crosses anterior to the 1st part of the subclavian artery.
Right: Anterior to scalenus anterior and crosses anterior to the 2nd part of the subclavian artery.
On both sides, the phrenic nerve runs posterior to the subclavian vein and posterior to the internal thoracic artery as it enters the thorax.
A 43 year old lady is donating her left kidney to her sister and the surgeons are harvesting the left kidney. Which of the following structures will lie most anteriorly at the hilum of the left kidney?
Left renal artery Left renal vein Left ureter Left ovarian vein Left ovarian artery
The renal veins lie most anteriorly, then artery and ureter lies posteriorly.
What is the sensory nerve supply to the skin overlying the angle of the jaw?
Maxillary branch of the trigeminal nerve Mandibular branch of the trigeminal nerve C3-C4 Greater auricular nerve (C2-C3) Buccal branch of the facial nerve
The trigeminal nerve is the major sensory nerve to the face except over the angle of the jaw. The angle of the jaw is innervated by the greater auricular nerve.
A 63 year old man is undergoing a coronary artery bypass procedure. During the median sternotomy which structure would routinely require division?
Parietal pleura Interclavicular ligament Internal mammary artery Brachiocephalic vein Left vagus nerve
The interclavicular ligament lies at the upper end of a median sternotomy and is routinely divided to provide access. The pleural reflections are often encountered and should not be intentionally divided, if they are, then a chest drain will need to be inserted on the affected side as collections may then accumulate in the pleural cavity. Other structures encountered include the pectoralis major muscles, again if the incision is truly midline then these should not require formal division. The close relationship of the brachiocephalic vein should be borne in mind and it should be avoided, iatrogenic injury to this structure will result in considerable haemorrhage.
A 42 year old woman complains of a burning pain of her anterolateral thigh which worsens on walking. There is a positive tinel sign over the inguinal ligament. Which nerve is affected?
Ilioinguinal nerve Genitofemoral nerve Lateral cutaneous nerve of the thigh Femoral nerve Saphenous nerve
The lateral cutaneous nerve supplies sensation to the anterior and lateral aspect of the thigh. Entrapment is commonly due to intra and extra pelvic causes. Treatment involves local anaesthetic injections.
