20 Questions
Which cranial nerve innervates the sternocleidomastoid muscle?
Cranial nerve XI
Which muscle is primarily responsible for initiating abduction of the shoulder joint?
Supraspinatus
Which artery provides the primary blood supply to the femoral head in adults?
Medial circumflex femoral artery
Which nerve is responsible for the sensory innervation of the palmar surface of the thumb?
Median nerve
Which carpal bone is most commonly fractured?
Scaphoid
Which dermatome corresponds to the area of the little finger?
C8
Which nerve is responsible for the motor innervation of the trapezius muscle?
Accessory nerve
Which structure passes through the foramen ovale?
Mandibular nerve
Which muscle initiates abduction of the shoulder joint beyond 15 degrees?
Deltoid
Which nerve provides sensory innervation to the palmar surface of the index finger?
Median nerve
Which nerve passes through the foramen ovale?
Mandibular nerve
Which muscle is NOT part of the rotator cuff?
Teres major
At which level of the vertebrae is the sternal angle located?
T4-T5
Which muscle forms the floor of the cubital fossa?
Brachialis
Where does the majority of lymphatic drainage from the breast go to?
Axillary lymph nodes
Which tendons border the anatomical snuffbox?
Extensor pollicis longus, extensor pollicis brevis, abductor pollicis longus
Which artery is a branch of the external carotid artery?
Superior thyroid artery
Which anatomical structure does the ulnar nerve pass through at the elbow?
Cubital tunnel
Which nerve supplies the parasympathetic fibers to the heart?
Vagus nerve
Which muscle is innervated by the deep peroneal (fibular) nerve?
Tibialis anterior
Study Notes
Muscles and Nerves
- The trapezius and sternocleidomastoid muscles are innervated by the accessory nerve (cranial nerve XI).
- The median nerve provides sensory innervation to the palmar surface of the thumb, index, middle, and lateral half of the ring finger.
- The supraspinatus muscle is responsible for initiating the first 15 degrees of shoulder abduction.
Blood Supply
- The medial circumflex femoral artery provides the most significant blood supply to the femoral head in adults.
Fractures
- The scaphoid is the most commonly fractured carpal bone, typically due to a fall on an outstretched hand.
Dermatomes
- The C8 dermatome corresponds to the area of the little finger.
Structures and Passages
- The mandibular nerve (V3), a branch of the trigeminal nerve (cranial nerve V), passes through the foramen ovale.
- The brachialis muscle forms the floor of the cubital fossa.
- The anatomical snuffbox is bordered by the tendons of the extensor pollicis longus, extensor pollicis brevis, and abductor pollicis longus.
- The ulnar nerve passes through the cubital tunnel at the elbow.
Arteries
- The superior thyroid artery is a branch of the external carotid artery.
Heart and Nervous System
- The parasympathetic fibers to the heart are supplied by the vagus nerve (cranial nerve X).
- The tibialis anterior muscle is innervated by the deep peroneal (fibular) nerve.
Anatomy
- The sternal angle, or Angle of Louis, is at the level of the T4-T5 vertebrae.
- The central tendon of the diaphragm is derived from the septum transversum.
- The Hesselbach's triangle is bounded by the inguinal ligament, inferior epigastric vessels, and the lateral border of the rectus abdominis muscle.
- The esophagus is located in the posterior mediastinum.
Aneurysms
- The most common site for intracranial berry aneurysms is the anterior communicating artery.
Test your knowledge of human muscles, nerves, and blood supply with this quiz. Topics include innervation of muscles, sensory innervation, and blood supply to specific body parts.
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