On the blow-hole of the porpoise / by Francis Sibson ; communicated by Thomas Bell.

  • Sibson, F. (Francis), 1814-1876.
Date:
1848
Catalogue details

Licence: Public Domain Mark

Credit: On the blow-hole of the porpoise / by Francis Sibson ; communicated by Thomas Bell. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    No. 2. Figs. 1.2 (figs. 7-8. Archives of the Royal Society). The anterior inferior sac. Muscular. Nos. 3.3. Figs. 1.2 (fig. 8. Archives of the Royal Society). The two posterior sacs. Membranous. The sacs communicate with the nasal canal. No. 4. Fig. 2. Semicartilaginous mass in front of the blow-hole. No. 5. Fig. 2. Muscle, arising from the frontal bone, inserted into the semicartila- ginous mass (4) in front of the blow-hole ; with its fellow it draws that mass backwards to close the blow-hole. No. 6. Fig. 2. Muscle that, with its fellow, opens the blow-hole by drawing forwards the semicartilaginous mass in front of the blow-hole. No. 7- Fig. 2. Muscle that dilates the outlet by drawing backwards its posterior wall. No. 8. Fig. 2. Muscle that compresses and empties the anterior superior sac (1). No. 8 a. Fig. 2. Deeper muscle that envelopes, compresses and empties the ante- rior superior sac, and dilates the outlet of the blow-hole by drawing for- wards and sideways its anterior and lateral walls. No. 9. Fig. 2. Fan-shaped muscle that dilates the blow-hole by drawing backwards and outwards its posterior and lateral walls. No. 10. Fig. 2. Muscle that, with its fellow, arches over, compresses and empties the deep anterior sac (2). Nos. 11.12.13.14.15 (figs. 4.5.6. Archives of the Royal Society). The dilators of the nasal canal. Fan-shaped muscles, that arise like No. 9. from the cir- cumference of the fronto-facial ridge, and are inserted into and expand various portions of the walls of the nasal canal. Nos. 16.17.18.19 (figs. 6.7.8. Archives of the Royal Society). Compressors of the posterior sacs (3). No. 20. Fig. 1 (fig. 8. Archives of the Royal Society). Muscle that divides into two tendons (20 and 20 a.) and constricts the opening of the posterior sacs (3). No. 21. Fig. 1. Cartilage in front of the opening of the posterior lateral sac (3), into which is inserted No. 21 b (fig. 8. Archives of the Royal Society). A deep muscle that surrounds and constricts the opening of the posterior sac (3). Nos. 22.23. Fig. 1. Are sections of the tendons of the two following double-headed muscles 22 a. 22 b. 23 a. 23 b. Nos. 22 a. 23 a (fig. 7- Archives of the Royal Society). Are the two heads that with their fellows of the opposite side act from behind forwards to tighten the tendons 22.23, and so close the nasal canal below the openings of the ante- rior superior sacs (1), and, I conceive, constrict the openings of those sacs. Nos. 22 b. 23 b (fig. 7- Archives of the Royal Society). Are the two heads that act