Superior Thoracic Aperture | Kentucky State University

University:
Kentucky State University
Course:
BIO 301 | Human Anatomy
Academic year:

2024
Views:

0

Pages:

11
Author:

Tyshawn Shaffer

Superior Thoracic Aperture (Thoracic Inlet) Boundaries: • Anteriorly: upper border of manubrium sterni. • Posteriorly: upper border of T1. • On either side: inner borders of the 1st ribs of both sides and their costal cartilage. Structures passing through the thoracic inlet ..1/6 2 1- Trachea 2- Esophagus 3- Thoracic duct 4- Apex of both lungs and their cervical pleura 3 4 4 Structures passing through the thoracic inlet ..2/6 2 5 Arteries: • • • • • • 1- Brachiocephalic 2- Left common carotid 3- Left subclavian 4- Internal mammary 5- Superior intercostal 6- Thyroidea ima (if present) 4 1 3 Structures passing through the thoracic inlet ..3/6 Veins: • Union of the subclavian veins (1) and the internal jugular veins (2) to form brachiocephalic veins (3). • Inferior thyroid vein (4). 2 2 4 1 3 3 1 Structures passing through the thoracic inlet ..4/6 1 Nerves: • 1- Vagi nerves • 2- Left recurrent laryngeal nerve. • 3- Phrenic nerves. • 4- Sympathetic chains. 1 3 4 4 2 Structures passing through the thoracic inlet ..5/6 Muscles: • Lower parts of the sternohyoid and sternothyroid muscles (anteriorly). • Longus colli muscle (posteriorly). Structures passing through the thoracic inlet ..6/6 Supra pleural membrane Thymus gland (or its remains). Suprapleural membrane (Sibson’s fascia). Thymus Muscles of Thorax ..1/3 Muscle Origin Insertion Action Innervation Pectoralis major Sternum, Ribs 2-6 Intertubercular groove of humerus Adduct, Flex, Med Rotate Arm M&L pectorals Pectoralis minor Ribs 3-5 Coracoid process of scapula Depress, M&L Rotate scapula pectorals Serratus anterior Ribs 1-9 Scapula Protract, Long Thoracic Rotate scapula Muscles of Thorax ..2/3 Muscle Origin Insertion Trapezius Ligamentum Clavicle, nuchae, Spine & C7-T12 acromion of scapula Action Innervation Elevate, Adduct, Rotate, Depress Accessory Levator Scapulae C1-C4 Medial border of scapula Elevate scapula D. Scapular Rhomboids Medial border of scapula Adduct, Elevate, Rotate D. Scapular C7-T5 Muscles of Thorax ..3/3 Muscle Origin Insertion Action Innervation Deltoid Clavicle, Spine & acromion of scapula Deltoid tuberosity of humerus Flex, Axillary Abduct, Extend, Lat & med. rotate arm Latissimus Iliac crest, dorsi Sacrum, T7-12, Lumbar fascia Intertubercular groove of humerus Extend, ThoracoAdduct, dorsal Med. rotate arm