Anatomy of the Ulna Bone
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Questions and Answers

What is the origin of the Flexor carpi radialis muscle?

  • Common flexor origin
  • Lateral epicondyle
  • Medial epicondyle (correct)
  • Coronoid process of ulna

How many muscles are in the superficial group of the anterior or flexor muscles of the forearm?

  • 3
  • 6
  • 4
  • 5 (correct)

What is the insertion of the Pronator teres muscle?

  • Base of the 2nd and 3rd metacarpal bones
  • Into palmar aponeurosis
  • Pisiform bone, hamate, and 5th metacarpal bones
  • Rough impression at the middle of the lateral side of the radius (correct)

What percentage of people are born without the Palmaris longus muscle?

<p>10% (D)</p> Signup and view all the answers

What is the origin of the Flexor pollicis longus muscle?

<p>From the anterior surface of the body of radius (B)</p> Signup and view all the answers

What is the insertion of the Flexor digitorum profundus muscle?

<p>Bases of the distal phalanges of medial 4 fingers (C)</p> Signup and view all the answers

How many muscles are in the deep group of the anterior or flexor muscles of the forearm?

<p>3 (B)</p> Signup and view all the answers

What is the insertion of the Pronator quadratus muscle?

<p>Lower 1/4 of the lateral border and anterior surface of the radius (A)</p> Signup and view all the answers

What is the action of the lumbricales muscles on the phalanges?

<p>They flex the first phalanges at the metacarpo-phalangeal joints (D)</p> Signup and view all the answers

How many dorsal interossei muscles are there in the hand?

<p>4 (C)</p> Signup and view all the answers

What is the nerve supply of the interossei muscles?

<p>Ulnar nerve (C)</p> Signup and view all the answers

What is the action of the palmar interossei muscles on the fingers?

<p>They adduct the fingers to the imaginary line (D)</p> Signup and view all the answers

What is the function of the pectoralis major muscle in the upper limb?

<p>Flexes and medially rotates the arm (A)</p> Signup and view all the answers

Which muscle is responsible for flexing the wrist and medial 1/2 of flexor digitorum profundus?

<p>Flexor carpi ulnaris (A)</p> Signup and view all the answers

How many phalanges are present in the fingers of the hand, excluding the thumb?

<p>3 (A)</p> Signup and view all the answers

What is the shape of the body of the ulna in the upper 3/4?

<p>Triangular (A)</p> Signup and view all the answers

What is the result of a lesion of the median nerve?

<p>Ape hand (D)</p> Signup and view all the answers

How many muscles are present in the pectoral region of the shoulder?

<p>4 (D)</p> Signup and view all the answers

How many muscles are supplied by the ulnar nerve in the upper limb?

<p>15 1/2 (A)</p> Signup and view all the answers

What is the name of the concave surface on the lateral side of the coronoid process of the ulna?

<p>Radial notch (C)</p> Signup and view all the answers

What is the result of a lesion of both the ulnar and median nerves?

<p>Complete claw hand (D)</p> Signup and view all the answers

How many carpal bones are present in the proximal row of the wrist?

<p>4 (C)</p> Signup and view all the answers

What is the name of the muscle that connects the clavicle to the scapula?

<p>Subclavius (C)</p> Signup and view all the answers

What is the name of the process that projects medially and below the head of the ulna?

<p>Styloid process (D)</p> Signup and view all the answers

Flashcards

Radial Notch

A concave surface on the ulna that articulates with the radius, forming the superior radio-ulnar joint.

Ulna Body Shape

Triangular in the upper ¾ and cylindrical in the lower ¼.

Ulna Head

Small, rounded part of the ulna, articulating with the radius.

Ulna Styloid Process

A projection from the ulna's lower end, pointing medially.

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Carpal Bones

8 small bones forming 2 rows in the wrist.

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Metacarpal Bones

5 bones forming the palm of the hand, one for each finger.

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Phalanges

14 finger bones (3 per finger, except the thumb which has 2).

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Pectoralis Major

Shoulder muscle, flexing and adducting the arm.

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Interossei Muscles

Hand muscles that move fingers.

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Palmar Interossei

Adduct fingers.

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Dorsal Interossei

Abduct fingers.

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Ulnar Nerve

A nerve controlling 16 muscles in the forearm and hand

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Median Nerve

Nerve controlling various forearm and hand muscles

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Flexor Muscles

Forearm muscles responsible for flexing the wrist and fingers.

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Pronator Teres

A muscle that pronates the forearm (turns palm down).

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Flexor Carpi Radialis

A muscle that flexes the wrist, towards the radius

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Flexor Carpi Ulnaris

Flexes the wrist toward the ulna.

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Flexor Digitorum Superficialis

Flexes the middle phalanges of the fingers.

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Flexor Digitorum Profundus

Flexes distal phalanges of the fingers.

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Flexor Pollicis Longus

Flexes the thumb.

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Pronator Quadratus

Pronates the forearm.

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Study Notes

Upper Limb Bones

  • Radial notch: a concave surface on the lateral side of the coronoid process that articulates with the head of the radius to form the superior radio-ulnar joint.
  • Ulna body: triangular in the upper ¾ and cylindrical in the lower ¼.
  • Lower end of ulna:
    • Head: small and rounded, articulating with the medial side of the lower end of the radius to form the inferior radio-ulnar joint.
    • Styloid process: projects medially and below the head.

Bones of the Hand

  • 27 bones in total, consisting of:
    • Carpal bones: 8 in number, arranged in 2 rows (proximal and distal).
    • Metacarpal bones: 5 in number, one for each finger.
    • Phalanges: 14 in number, with 3 in each finger (proximal, middle, and distal) except the thumb, which has only 2 (proximal and distal).

Muscles of the Upper Limb

Muscles of the Shoulder Region

  • 15 muscles divided into 3 groups:
    • Muscles of the pectoral region:
      • Pectoralis major: originates from the clavicle and sternum, inserts into the lateral lip of the bicipital groove of the humerus, and flexes and adducts the arm while medially rotating it.
      • Other muscles in this group include pectoralis minor, serratus anterior, and subclavius.

Muscles of the Hand

  • Interossei:
    • 4 dorsal interossei muscles: occupy the intervals between the metacarpal bones and are bipenniform muscles.
    • 3 or 4 palmar interossei muscles: smaller and placed on the palmar surfaces of the metacarpal bones.
    • All interossei muscles are supplied by the ulnar nerve.
  • Action of the interossei:
    • Palmar interossei: adduct the fingers to an imaginary line drawn longitudinally through the center of the middle finger.
    • Dorsal interossei: abduct the fingers from that line.

Nerve Supply

  • Ulnar nerve (C.8 and T.1) is motor to 15 ½ muscles:
    • 1 ½ muscles in the front of the forearm.
    • 14 short muscles in the hand.
  • Median nerve (C.5, 6, 7, 8, and T.1) is motor to 12 ½ muscles:
    • 6 ½ muscles in the front of the forearm.
    • 6 short muscles in the hand.

Muscles of the Forearm

  • Anterior or flexor muscles: 8 in number, consisting of:
    • Superficial group: 5 muscles, including pronator teres, flexor carpi radialis, palmaris longus, flexor carpi ulnaris, and flexor digitorum superficialis.
    • Deep group: 3 muscles, including flexor digitorum profundus, flexor pollicis longus, and pronator quadratus.

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Description

This quiz covers the structure and features of the ulna bone, including the radial notch, body, and lower end components.

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