Podcast
Questions and Answers
What condition is known to be commonly associated with carpal tunnel syndrome?
What condition is known to be commonly associated with carpal tunnel syndrome?
Which nerve roots comprise the median nerve?
Which nerve roots comprise the median nerve?
Which of the following muscles is NOT supplied by the median nerve?
Which of the following muscles is NOT supplied by the median nerve?
What is the clinical sign associated with median nerve injury characterized by the inability to pinch the thumb and index finger together?
What is the clinical sign associated with median nerve injury characterized by the inability to pinch the thumb and index finger together?
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Which of the following represents a positive Phalen’s sign?
Which of the following represents a positive Phalen’s sign?
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Which branch of the median nerve provides sensory supply to the lateral 3 and a half digits?
Which branch of the median nerve provides sensory supply to the lateral 3 and a half digits?
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In terms of anatomical relation at the cubital fossa, how does the median nerve pass compared to the brachial artery?
In terms of anatomical relation at the cubital fossa, how does the median nerve pass compared to the brachial artery?
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Which test is commonly used to assess for carpal tunnel syndrome involving tapping over the median nerve?
Which test is commonly used to assess for carpal tunnel syndrome involving tapping over the median nerve?
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Which vein is considered the best for intravenous infusion in the upper limb?
Which vein is considered the best for intravenous infusion in the upper limb?
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What is the main artery of the thumb?
What is the main artery of the thumb?
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Which nerve passes between the two heads of the pronator teres muscle?
Which nerve passes between the two heads of the pronator teres muscle?
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What part of the median nerve supplies the deep flexor muscles in the forearm?
What part of the median nerve supplies the deep flexor muscles in the forearm?
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Which of the following is NOT a branch of the thyrocervical trunk?
Which of the following is NOT a branch of the thyrocervical trunk?
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Which vein is part of the superficial venous drainage of the upper limb?
Which vein is part of the superficial venous drainage of the upper limb?
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What is the main artery supplying the index finger?
What is the main artery supplying the index finger?
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Which muscle groups are supplied by the deep branch of the median nerve?
Which muscle groups are supplied by the deep branch of the median nerve?
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What is the primary characteristic of a pivot joint?
What is the primary characteristic of a pivot joint?
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What type of muscle movement is defined as a decrease in angle between two body parts?
What type of muscle movement is defined as a decrease in angle between two body parts?
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Which muscle is primarily responsible for the kicking action in football?
Which muscle is primarily responsible for the kicking action in football?
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Which joint type allows for gliding movements between bone surfaces?
Which joint type allows for gliding movements between bone surfaces?
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What type of joint is the inferior tibiofibular joint classified as?
What type of joint is the inferior tibiofibular joint classified as?
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Which of the following movements is considered external rotation?
Which of the following movements is considered external rotation?
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What is the main action of the popliteus muscle?
What is the main action of the popliteus muscle?
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Which term describes the combination of movements involving circular motion at a joint?
Which term describes the combination of movements involving circular motion at a joint?
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What is the primary role of tendons in muscles?
What is the primary role of tendons in muscles?
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What type of joint is characterized by a concave surface fitting into a convex surface?
What type of joint is characterized by a concave surface fitting into a convex surface?
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Which muscle is supplied by the ulnar nerve aside from the hypothenar muscles?
Which muscle is supplied by the ulnar nerve aside from the hypothenar muscles?
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What syndrome is associated with ulnar nerve compression at the wrist?
What syndrome is associated with ulnar nerve compression at the wrist?
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Which test is positive in case of palmar interossei damage?
Which test is positive in case of palmar interossei damage?
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The ulnar nerve originates from which part of the brachial plexus?
The ulnar nerve originates from which part of the brachial plexus?
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What is the primary function of the ulnar nerve?
What is the primary function of the ulnar nerve?
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Which of the following nerves is known as the 'Musician nerve'?
Which of the following nerves is known as the 'Musician nerve'?
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Which of the following structures does the ulnar nerve pass through at the elbow?
Which of the following structures does the ulnar nerve pass through at the elbow?
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Which test is performed to assess the function of the ulnar nerve and is commonly used in leprosy patients?
Which test is performed to assess the function of the ulnar nerve and is commonly used in leprosy patients?
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What is the primary function of the Vastus Intermedius muscle?
What is the primary function of the Vastus Intermedius muscle?
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Which nerve innervates the anterior compartment of the thigh?
Which nerve innervates the anterior compartment of the thigh?
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What structures form the floor of the femoral triangle?
What structures form the floor of the femoral triangle?
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Which of the following muscles is also known as the 'Footballer’s Muscle'?
Which of the following muscles is also known as the 'Footballer’s Muscle'?
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What is contained medial to lateral in the femoral triangle?
What is contained medial to lateral in the femoral triangle?
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Which muscle is referred to by multiple names such as 'Honeymoon muscle' and 'Kick muscle'?
Which muscle is referred to by multiple names such as 'Honeymoon muscle' and 'Kick muscle'?
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Which nerve is specifically associated with the anterior division of the femoral nerve?
Which nerve is specifically associated with the anterior division of the femoral nerve?
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What does the femoral sheath consist of?
What does the femoral sheath consist of?
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Study Notes
Carpal Tunnel Syndrome
- Injury to the median nerve leads to carpal tunnel syndrome, often seen in conditions like rheumatoid arthritis and myxoedema.
- Affects computer workers due to repetitive wrist movements.
Median Nerve Anatomy
- Originates from nerve roots C5 to T1 (C5, C6, C7 - lateral root; C8, T1 - medial root).
- Passes laterally to the brachial artery, crossing medially at the coracobrachialis to reach the cubital fossa.
- Supplies sensory innervation to the lateral 3.5 of the palm and nail beds, and motor branches to thenar muscles and lumbricals.
Signs of Median Nerve Injury (CAP-BPT)
- C: Carpal tunnel syndrome
- A: Ape thumb deformity
- P: Pointing index sign (Oschner's class test)
- B: Benediction hand (pope hand deformity)
- P: Phalen’s sign
- T: Tinel sign
- OK sign indicates anterior interosseous nerve involvement (AIN).
Muscle Anatomy
- Body contains approximately 639 muscles, modified cells rich in actin and myosin.
- Two components of muscle: belly (contractile) and tendon (non-contractile), while aponeurosis represents flat tendon forms.
Joint Movements
- Movements occur predominantly across joints crossed by muscles.
- Flexion: decrease in angle; Extension: increase in angle; Adduction: movement towards midline; Abduction: movement away from midline; Internal rotation: rotation towards midline; External rotation: rotation away from midline; Circumduction: circular movement combining all angles.
Key Muscles and Their Actions
- Popliteus: initiates knee flexion (unlocking).
- Quadriceps femoris: responsible for knee extension (locking).
- Tibialis anterior & posterior: responsible for foot inversion.
- Peroneus longus & brevis: responsible for foot eversion.
Upper Limb Veins
- Dorsal venous arch: crucial for venous drainage.
- Cephalic vein: prominent superficial vein.
- Basilic vein: also significant for drainage.
- Medial cubital vein: preferred for intravenous infusion.
Brachial Plexus
- Comprised of six roots (C5, C6, C7, C8, T1) forming three trunks; it is crucial for upper limb nerve supply.
- Median nerve traverses between the heads of the pronator teres, with potential compression leading to pronator teres syndrome.
- At the wrist, the median nerve passes through the carpal tunnel.
Ulnar Nerve Anatomy
- Originates from the medial cord of the brachial plexus with root values C7-C8-T1.
- Located medially to the axillary artery, crosses the medial epicondyle and through two heads of flexor carpi ulnaris.
- At the wrist, it passes through Guyon's canal.
Clinical Tests for Ulnar Nerve
- A: A/Ulnar nerve.
- B: Book test.
- C: Card test (positive in palmar interossei damage).
- D: Adductor pollicis test.
- E: Egawa test (positive in dorsal interossei damage).
- F: Froment test.
- G: Guyon’s tunnel syndrome.
- H: Handlebar palsy.
Important Nerves and Their Functions
- Musculocutaneous nerve: referred to as the "labourer's nerve".
- Median nerve: known as the "musician's nerve".
- Ulnar nerve: referred to as "eye of the hand".
Femoral Triangle
- A triangular depression below the inguinal ligament: bounded by adductor longus, pectineus, psoas major tendon, and iliacus.
- Contains femoral vein, artery, and nerve (VAN) arranged medial to lateral.
- Femoral sheath: a deep fascia modification surrounding femoral vessels, contains vein, artery, lymph nodes, but not nerve.
Cadaveric Anatomy Focus
- Basic muscle identification techniques and understanding nerve supply to specific muscles are vital for clinical applications and exams.
- Familiarity with muscle functions, locations, and interactions enhances understanding of human anatomy.
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Description
This quiz explores the causes and effects of carpal tunnel syndrome, a condition often related to connective tissue disorders like rheumatoid arthritis and certain occupations. It also covers the sensory branches of the nerves supplying the hand and related dermatomes.
