This document describes the midline structures of the neck from the symphysis menti to the suprasternal notch. It outlines various midline structures including the hyoid bone, thyroid cartilage, cricoid cartilage, tracheal rings, isthmus of the thyroid gland, and jugular venous arch. Key structures identified include the hyoid bone at the level of C3, thyroid cartilage at C4, cricoid cartilage at the level of C6, and the suprasternal notch opposite the lower border of T2.

1. MIDLINE STRUCTURES OF
NECK
DR.S.R.SITA

2. EXTENT
• SYMPHYSIS MENTI TO SUPRASTERNAL
NOTCH
• BELOW THE SKIN,SUPERFICIAL FASCIA
AND DEEP FASCIA

3. SYMPHYSIS MENTI
• POINT WHERE THE TWO HALVES OF
THE BODY OF MANDIBLE MEET IN
MIDLINE

4. FIBROUS RAPHE
• SYMPHYSIS MENTI TO HYOID BONE
• MYOLOHOID MUSCLES OF BOTH SIDES
UNITE TO FORM FLOOR OF THE
MOUTH(DIAPHRAGMA ORIS)

5. HYOID BONE
• HORSHOE SHAPED BONE,C 3
VERTEBRA
• SUSPENDED INFERIOR TO THE
MANDIBLE BY THE STYLOHYOID
LIGAMENT
• NO BONY ARTICULATION
• ATTACHED TO ONLY MUSCLES AND
LIGAMENTS
• SUPRA HYOID AND INFRAHYOID
REGIONS

7. MEDIAN THYROHYOID LIGAMENT
• MIDLINE THICKENING OF
THYROHYOID MEMBRANE WHICH
CONNECTS UPPER BORDER OF
THYROID CARTILAGE TO UPPER
BORDER OF HYOID BONE
• SUB HYOID BURSA SEPARATES THE
MEMBRANE FROM HYOID BONE

8. UPPER BORDER OF THYROID CARTILAGE
• C 4 VERTEBRA
• NOTCHED

9. ANGLE OF THYROID CARTILAGE
• LARYNGEAL PROMINENCE
• MORE PROMINENT IN ADULT MALES-
ADAM’S APPLE

10. MEDIAN CRICOTHYROID LIGAMENT
• MIDLINE THICKENING OF
CRICOTHYROID MEMBRANE – FROM
UPPER BORDER OF CRICOID
CARTILAGE TO LOWER BORDER OF
THYROID CARTILAGE

11. CRICOID CARTILAGE
• LOWER BORDER OF C6 VERTEBRA
• STRUCTURES LOCATED AT THIS LEVEL
1. JUNCTION OF LARYNX AND
TRACHEA
2. JUNCTION OF PHARYNX AND
OESOPHAGUS
3. ANTERIOR TUBERCLE OF C6
VETEBRA-CAROTID TUBERCLE

12. FIRST TRACHEAL RING
• JUST ABOVE THE ISTHUMUS OF
THYROID GLAND

13. ISTHUMUS OF THYROID GLAND
• LIES IN FRONT OF 2,3,4 TRACHEAL
RINGS

14. INFERIOR THYROID VEINS
• IN FRONT 5,6,7 TRACHEAL RINGS

15. THYROIDEA IMA ARTERY
• FROM BRACHIOCEPHALIC ARTERY
• ASCENDS FROM TRACHEA TO
ISTHUMUS OF THYROID GLAND

16. JUGULAR VENOUS ARCH
• CONNECTS 2 ANTERIOR JUGULAR
VEINS JUST ABOVE SUPRASTERNAL
NOTCH

17. SUPRASTERNAL NOTCH
• BETWEEN ANTERIOR ENDS OF
CLAVICLE
• LIES OPPOSITE THE LOWER BORDER
OF T2 VERTEBRA
• LEFT BRACHIOCEPHALIC VEIN AND
ARTERY MAY LIE IN FRONT OF
TRACHEA IN THE SUPRASTERNAL
NOTCH

18. SUMMARY

19. MIDLINE NECK SWELLINGS

20. TRACHEOSTOMY

21. CUT THROAT WOUNDS