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Human lungs. 1 and 2 make up the larynx, or voice box. 1 is thyroid cartilage, 2 is cricoid cartilage. A thin layer is held stretched from the top of the thyroid cartilage and extends to the hyoid bone, which is the only bone in the body that is not connected to another bone.

Human Lungs

Human lungs. 1 and 2 make up the larynx, or voice box. 1 is thyroid cartilage, 2 is cricoid cartilage.…

"The lungs fill up most of the cavity of the chest. One lies on either side of the heart which is in the middle of the chest. The lungs in animals are called lights because they are spongy sacs and so light as to float when thrown into water." —Davison, 1910

The lungs

"The lungs fill up most of the cavity of the chest. One lies on either side of the heart which is in…

"The mouth, nose and pharynx, with the commencement of the gullet and larynx, as exposed by a section, a little to the left of the median plane of the head. a, vertebral column; b, gullet; c, wind-pipe; d, larynx; e, epiglottis; f, soft palate; g, opning of eustachian tube; k, tongue; l, hard palate; m, the sphenoid bone on the base of the skull; n, the fore part of the cranial cavity; o, p, q, the turbinate bones of the outer side of the left nostril-chamber." —Martin, 1917

Mouth

"The mouth, nose and pharynx, with the commencement of the gullet and larynx, as exposed by a section,…

The mouth, nose, and pharynx, with the commencement of gullet (esophagus) and larynx, as exposed by a section a little to the left of the median plane of the head. Labels: a, vertebrae; b, gullet; c, trachea; d, larynx; e, epiglottis; f, soft palate; g, opening of Eustachian tube; k, tongue; l, hard palate; o, p, q, inferior turbinate bones of left nasal chamber.

The Mouth, Nose, and Pharynx

The mouth, nose, and pharynx, with the commencement of gullet (esophagus) and larynx, as exposed by…

The mouth, nose, and pharynx, with the larynx and commencement of gullet (esophagus), seen in section. Labels: a, vertebral column; b, gullet (esophagus); c, trachea; d, larynx; e, epiglottis; f, soft palate, between f and e is the opening at back of cavity or faces; g, opening of Eustachian tube; h, nasal cavity; k, tongue; l, hard palate; m, sphenoid bone at base of skull; n, roof of nasal cavity; o, p, q, placed in nasal cavity.

The Mouth, Nose, and Pharynx

The mouth, nose, and pharynx, with the larynx and commencement of gullet (esophagus), seen in section.…

The mouth, nose, and pharynx, with the commencement of the gullet (esophagus) and larynx, as exposed by a section, a little to the left of the median plane of the head. Labels: a, vertebral column; b, gullet; c, windpipe; d, larynx; e, epiglottis; f, soft palate; g, opening of Esutachian tube; k, tongue; l, hard palate; m; the sphenoid bone on the base of the skull; n, the fore part of the cranial cavity; o,p,q, the turbinate bones of the outer side of the left nostril chamber.

The Mouth, Nose, and Pharynx

The mouth, nose, and pharynx, with the commencement of the gullet (esophagus) and larynx, as exposed…

"Diagram of a Sectional View of Nasal and Throat Passageways. <em>C</em>, nasal cavities; <em>T</em>, tongue; <em>L</em>, lower jaw; <em>M</em>, Mouth; <em>U</em>, uvula; <em>E</em>, epiglottis; <em>G</em>, larynx; <em>O</em>, gullet, or esophagus." &mdash; Blaisedell, 1904

Nasal and throat passageways

"Diagram of a Sectional View of Nasal and Throat Passageways. C, nasal cavities; T,…

Anterior part of section across neck at level of false vocal cords; on left side ventricle of larynx is exposed.

Anterior Part of Section Across Neck at False Vocal Cords

Anterior part of section across neck at level of false vocal cords; on left side ventricle of larynx…

Anterior part of section across neck at level of fourth cervical vertebra, passing through upper part of superior aperture of larynx.

Anterior Part of Section Across Neck at Fourth Cervical Vertebra

Anterior part of section across neck at level of fourth cervical vertebra, passing through upper part…

Modes of approach to the esophagus and the cervical sympathetic ganglion shown by means of a cross section of the neck at the level of the 7th cervical vertebra. A: Approach to esophagus internal to carotid sheath. B : An incision in midline beneath the hyoid bone to the esophagus. C: An approach similar to (A), median to the carotid sheath, and (D), external to the carotid sheath, to expose the cervical sympathetic ganglion and trunk and the inferior, thyroid artery.

Cross Section of Neck at the 7th Cervical Vertebra

Modes of approach to the esophagus and the cervical sympathetic ganglion shown by means of a cross section…

Section of the neck through larynx.

Cross Section of Neck Through the Larynx

Section of the neck through larynx.

Muscles of the soft palate, the pharynx being laid open from behind and mucous membrane removed.

Muscles of the Soft Palate

Muscles of the soft palate, the pharynx being laid open from behind and mucous membrane removed.

"Showing its distribution by its branches and ganglia to the larynx, pharynx, heart, lungs, and other parts." — Blaisedell, 1904

Trunk of the Pneumogastric Nerve

"Showing its distribution by its branches and ganglia to the larynx, pharynx, heart, lungs, and other…

Outline showing the general form of the larynx, trachea, and bronchi, as seen from behind. Labels: h, the great cornu of the hyoid bone; e,epiglottis; t, superior cornu of the thyroid cartilage ; t1, inferior cornu of the thyroid cartilage; a, points to the back of both the arytenoid cartilages, which are surmounted by the cornicula; c, the middle ridge on the back of the cricoid cartilage; tr, the posterior membranous part of the trachea; b, b1, right and left bronchi.

Back View of Respiratory Apparatus

Outline showing the general form of the larynx, trachea, and bronchi, as seen from behind. Labels: h,…

Outline showing the general form of the larynx, trachea, and bronchi, as seen from front. Labels: h, the great cornu of the hyoid bone; e,epiglottis; t, superior and inferior cornu of the thyroid cartilage; c, middle of the cricoid cartilage; tr, the trachea, showing sixteen cartilaginous rings; b, the right bronchus; b1, the left bronchus.

Front View of Respiratory Apparatus

Outline showing the general form of the larynx, trachea, and bronchi, as seen from front. Labels: h,…

The development of the respiratory organs. A, is the esophagus of a chick on the fourth day of incubation, with the rudiments of the trachea on the lung of the left side, viewed laterally; 1, the inferior wall of the esophagus; 2, the upper portion of the same tube; 3, the rudimentary lung; 4, the stomach. B, is the same object seen from below, so that both lungs are visible. C, shows the tongue and respiratory organs of the embryo of a horse; 1, the tongue; 2, the larynx; 3, the trachea; 4, the lungs, viewed from the upper side.

Development of Respiratory Organs

The development of the respiratory organs. A, is the esophagus of a chick on the fourth day of incubation,…

"Larynx, trachea, and bronchi, showing the manner of division, and the rings of cartilage." &mdash; Tracy, 1888

Respiratory system

"Larynx, trachea, and bronchi, showing the manner of division, and the rings of cartilage." —…

The respiratory system. Labels: 1. the larynx; 2. the trachea; 3. right bronchia; 4. left bronchia; 5. left lung divided into three lobes; 7. large bronchial tubes; 8. small bronchial tubes ending in air cells or vesicles.

Respiratory System

The respiratory system. Labels: 1. the larynx; 2. the trachea; 3. right bronchia; 4. left bronchia;…

The respiratory system. Labels: 1, larynx; 2, trachea; 3, right lung; 4, left lung; 5, heart.

Respiratory System

The respiratory system. Labels: 1, larynx; 2, trachea; 3, right lung; 4, left lung; 5, heart.

Diagram of rima glottidis. A, during ordinary easy breathing. B, widely opened.

Rima Glottidis

Diagram of rima glottidis. A, during ordinary easy breathing. B, widely opened.

"Larynx, Trachea, and the Bronchi. (Front view.) <em>A</em>, epiglottis; <em>B</em>, thyroid cartilage; <em>C</em>, cricothyroid membrane, connecting with the cricoid cartilage below, all forming the larynx; <em>D</em>, rings of the trachea." &mdash; Blaisedell, 1904

Trachea

"Larynx, Trachea, and the Bronchi. (Front view.) A, epiglottis; B, thyroid cartilage;…

This illustration shows the vocal cords as seen from above during phonation (A. Thyroid Cartilage; B. Cricoid Cartilage; C. hyoid bone; D. Rings of trachea; E. Epiglottis; F. Arytenoid Cartilage; G. Thyro-arytenoid muscle; H. Adam's Apple; I. False Vocal Cords; J. True Vocal Cords; K. Ventricle; L. Rima Glottis).

Vocal Cords Seen from above During Phonation

This illustration shows the vocal cords as seen from above during phonation (A. Thyroid Cartilage; B.…

Three laryngoscopic view of the superior aperture of the larynx and surrounding parts. Labels: A, the glottis during the emission of a high note in singing; B, in easy and quite inhalation of air; C, in the state of widest possible dilation, as in inhaling a very deep breath. The diagrams A', B', and C', show in horizontal sections of the glottis in position of the vocal ligaments and arytenoid cartilages in the three several states represented in the other figures. In all the figures, so far as marked, the letters indicate the parts as follows, viz. : l, the base of the tongue; e, the upper free part of the epiglottis; e', the tubercle or cushion of the epiglottis; p h, part of the anterior all of the pharynx behind the larynx; in the margin of the aryteno-epiglottisdean fold w, the swelling of the membrane caused by the cartilages of Wrisberg; s. that of the cartilages of Santorini: a, the tip or summit of the arytenoid cartilages; c v, the true vocal cords r lips of the rima glottidis; c v s, the superior or false vocal cords; between them the ventricle of the larynx; in C, tr, is placed on the anterior wall of the receding trachea, and b indicated the commencement of the two bronchi beyond the bifurcation which may be brought into view in this state of extreme dilation.

Movement of the Vocal Cords

Three laryngoscopic view of the superior aperture of the larynx and surrounding parts. Labels: A, the…